Difference between revisions of "KTurtle/C3/Common-Errors-in-KTurtle/English-timed"

From Script | Spoken-Tutorial
Jump to: navigation, search
 
(One intermediate revision by the same user not shown)
Line 2: Line 2:
 
|'''Time'''
 
|'''Time'''
 
|'''Narration'''
 
|'''Narration'''
 +
 
|-
 
|-
−
|| 00:01
+
|00:01
−
|| Welcome to this tutorial on '''Common Errors in KTurtle.'''
+
|Welcome to this tutorial on '''Common Errors in KTurtle.'''
 +
 
 
|-
 
|-
−
|| 00:07
+
|00:07
−
||In this tutorial, we will learn about:
+
|In this tutorial, we will learn about:
 +
 
 
|-
 
|-
−
|| 00:10
+
|00:10
−
||* '''Syntax errors'''   
+
|'''Syntax errors'''   
  
 
|-
 
|-
−
|| 00:12
+
|00:12
−
||* '''Run time errors'''  and
+
|'''Run time errors'''  and
  
 
|-
 
|-
−
|| 00:14
+
|00:14
−
||* '''Logical errors'''.
+
|'''Logical errors'''.
 +
 
 
|-
 
|-
−
|| 00:17
+
|00:17
−
||To record this tutorial, I am using:
+
|To record this tutorial, I am using:
  
 
|-
 
|-
−
||00:20
+
|00:20
−
|* '''Ubuntu Linux OS''' version '''12.04'''  
+
|'''Ubuntu Linux OS''' version '''12.04'''  
  
 
|-
 
|-
−
|| 00:25
+
|00:25
−
|* '''KTurtle''' version '''0.8.1 beta'''.
+
|'''KTurtle''' version '''0.8.1 beta'''.
 +
 
 
|-
 
|-
−
|| 00:31
+
|00:31
−
||We assume that you have basic working knowledge of '''KTurtle'''.   
+
|We assume that you have basic working knowledge of '''KTurtle'''.   
  
 
|-
 
|-
−
|| 00:36
+
|00:36
 
|If not,  for relevant tutorials, please visit our website:  
 
|If not,  for relevant tutorials, please visit our website:  
 
http://spoken-tutorial.org'''
 
http://spoken-tutorial.org'''
 +
 
|-
 
|-
−
|| 00:42
+
|00:42
−
||Let's first define- What is an '''error'''?
+
|Let's first define- What is an '''error'''?
  
 
|-
 
|-
−
|| 00:46
+
|00:46
 
|'''Error''' is a mistake in a program that produces an incorrect or unexpected result.
 
|'''Error''' is a mistake in a program that produces an incorrect or unexpected result.
 +
 
|-
 
|-
−
||00:55
+
|00:55
−
||First, I will explain about types of '''errors.'''
+
|First, I will explain about types of '''errors.'''
 +
 
 
|-
 
|-
−
|| 01:00
+
|01:00
−
|| '''Syntax error''' is a violation of  grammatical rules of a programming language.
+
|'''Syntax error''' is a violation of  grammatical rules of a programming language.
  
 
|-
 
|-
−
|| 01:09
+
|01:09
 
|'''Compilation''' fails when a program has '''syntax errors'''.
 
|'''Compilation''' fails when a program has '''syntax errors'''.
  
 
|-
 
|-
−
|| 01:15
+
|01:15
 
|'''Syntax errors''' are easy to find and fix.
 
|'''Syntax errors''' are easy to find and fix.
  
 
|-
 
|-
−
|| 01:22
+
|01:22
−
|For Example:
+
|For Example:,Unmatched parentheses, square and curly braces.
  
 
|-
 
|-
−
|| 01:23
+
|01:29
−
||* Unmatched parentheses, square and curly braces.  
+
|Use of ''' variable''' that has not been declared.
  
 
|-
 
|-
−
|| 01:29
+
|01:34
−
||* Use of ''' variable''' that has not been declared.
+
|Missing '''quotes''' in '''strings.'''
  
 
|-
 
|-
−
|| 01:34
+
|01:38
−
||* Missing '''quotes''' in '''strings.'''
+
|Let's open a new '''KTurtle''' '''Application'''.
−
|-
+
−
|| 01:38
+
−
||Let's open a new '''KTurtle''' '''Application'''.
+
  
 
|-
 
|-
−
|| 01:42
+
|01:42
 
|Click on  '''Dash  home'''. In the '''Search bar''', type: "kturtle".
 
|Click on  '''Dash  home'''. In the '''Search bar''', type: "kturtle".
  
 
|-
 
|-
−
|| 01:48
+
|01:48
 
|Click on the  '''KTurtle''' icon.
 
|Click on the  '''KTurtle''' icon.
 +
 
|-
 
|-
−
||01:51
+
|01:51
−
||Let's begin the tutorial with some types of''' syntax errors'''.
+
|Let's begin the tutorial with some types of''' syntax errors'''.
 +
 
 
|-
 
|-
−
||01:58
+
|01:58
−
||I already have a program in a text-editor.  
+
|I already have a program in a text-editor.  
 +
 
 
|-
 
|-
−
|| 02:02
+
|02:02
−
||To explain the '''error''' in the program, I will '''comment''' part of the '''code'''.  
+
|To explain the '''error''' in the program, I will '''comment''' part of the '''code'''.  
 +
 
 
|-
 
|-
−
|| 02:09
+
|02:09
−
||Here, I will '''comment''' the line.  
+
|Here, I will '''comment''' the line.  
  
 
|-
 
|-
−
|| 02:11
+
|02:11
−
||'''$a=ask''' within double quotes "enter any number and click Ok".
+
|'''$a=ask''' within double quotes "enter any number and click Ok".
 +
 
 
|-
 
|-
−
||02:19
+
|02:19
−
||I will use hash(#) sign to '''comment''' the line.
+
|I will use hash(#) sign to '''comment''' the line.
 +
 
 
|-
 
|-
−
|| 02:23
+
|02:23
−
||I will copy the program from text-editor and paste it into Kturtle's editor.
+
|I will copy the program from text-editor and paste it into Kturtle's editor.
  
 
|-
 
|-
−
|| 02:31
+
|02:31
 
|Pause the tutorial here and type the program into  your '''KTurtle''' editor.  
 
|Pause the tutorial here and type the program into  your '''KTurtle''' editor.  
 +
 
|-
 
|-
−
|| 02:37
+
|02:37
 
|Resume the tutorial after typing the program.
 
|Resume the tutorial after typing the program.
 +
 
|-
 
|-
−
|| 02:42
+
|02:42
−
||Let's click on '''Run''' button to '''run''' the program.  
+
|Let's click on '''Run''' button to '''run''' the program.  
  
 
|-
 
|-
−
|| 02:47
+
|02:47
 
|Compiler shows the following error:
 
|Compiler shows the following error:
  
 
|-
 
|-
−
|| 02:50
+
|02:50
 
|"variable '$a' was used without first being assigned  to a value".
 
|"variable '$a' was used without first being assigned  to a value".
 +
 
|-
 
|-
−
|| 02:57
+
|02:57
−
||Here, the error is in line number 4.
+
|Here, the error is in line number 4.
  
 
|-
 
|-
−
||03:02
+
|03:02
−
||This is a '''syntax error'''. It occurred as the variable  'a' was not declared.
+
|This is a '''syntax error'''. It occurred as the variable  'a' was not declared.
 +
 
 
|-
 
|-
−
|| 03:10
+
|03:10
−
||So, I will go to line number 2, remove the '''comment'''.
+
|So, I will go to line number 2, remove the '''comment'''.
 +
 
 
|-
 
|-
−
||  03:14
+
|03:14
−
|| I will copy the program from text-editor and paste it into KTurtle's editor.
+
|I will copy the program from text-editor and paste it into KTurtle's editor.
 +
 
 
|-
 
|-
−
|| 03:23
+
|03:23
−
||Let's click on '''Run''' button to '''run''' the program.  
+
|Let's click on '''Run''' button to '''run''' the program.  
  
 
|-
 
|-
−
|| 03:27
+
|03:27
 
|Enter '6' for 'a' value and click '''OK'''.
 
|Enter '6' for 'a' value and click '''OK'''.
  
 
|-
 
|-
−
|| 03:31
+
|03:31
 
|Program runs without errors.  
 
|Program runs without errors.  
 +
 
|-
 
|-
−
|| 03:35
+
|03:35
−
||I will clear the current program from '''KTurtle''' editor.
+
|I will clear the current program from '''KTurtle''' editor.
  
 
|-
 
|-
−
|| 03:38
+
|03:38
 
|Type "clear" command and '''Run''' to clean the canvas.
 
|Type "clear" command and '''Run''' to clean the canvas.
 +
 
|-
 
|-
−
||03:43
+
|03:43
−
|| Let's next look at another error.
+
|Let's next look at another error.
 +
 
 
|-
 
|-
−
||03:46
+
|03:46
−
||I already have a program in a text-editor.  
+
|I already have a program in a text-editor.  
 +
 
 
|-
 
|-
−
|| 03:50
+
|03:50
−
||Here, the value of "pi" is predefined in KTurtle.
+
|Here, the value of "pi" is predefined in KTurtle.
 +
 
 
|-
 
|-
−
|| 03:54
+
|03:54
−
||Let's delete the '$' sign in the program.  
+
|Let's delete the '$' sign in the program.  
 +
 
 
|-
 
|-
−
||  03:58
+
|03:58
−
||I will copy the program from text editor and paste it into Kturtle's Editor.  
+
|I will copy the program from text editor and paste it into Kturtle's Editor.  
 +
 
 
|-
 
|-
−
|| 04:05
+
|04:05
 
|Pause the tutorial here and type the program into your  KTurtle editor.  
 
|Pause the tutorial here and type the program into your  KTurtle editor.  
  
 
|-
 
|-
−
|| 04:11
+
|04:11
 
|Resume the tutorial after typing the program.
 
|Resume the tutorial after typing the program.
 +
 
|-
 
|-
−
|| 04:16
+
|04:16
−
||Let's click on '''Run''' button to '''run''' the program.  
+
|Let's click on '''Run''' button to '''run''' the program.  
  
 
|-
 
|-
−
|| 04:19
+
|04:19
 
|Complier shows the following error:
 
|Complier shows the following error:
  
 
|-
 
|-
−
|| 04:22
+
|04:22
 
|"You cannot put '=' here".
 
|"You cannot put '=' here".
 +
 
|-
 
|-
−
|| 04:26
+
|04:26
−
||This error is in line number 2.  
+
|This error is in line number 2.  
 +
 
 
|-
 
|-
−
|| 04:30
+
|04:30
−
||This is a syntax error. It occurred as there is no '''container'''  of variable.
+
|This is a syntax error. It occurred as there is no '''container'''  of variable.
 +
 
 
|-
 
|-
−
|| 04:37
+
|04:37
−
||Let's go back to the program, replace the '$' sign.
+
|Let's go back to the program, replace the '$' sign.
 +
 
 
|-
 
|-
−
||  04:41
+
|04:41
−
||I will copy the program from text editor and paste it into KTurtle's editor.  
+
|I will copy the program from text editor and paste it into KTurtle's editor.  
 +
 
 
|-
 
|-
−
||04:49
+
|04:49
−
||Let's click on '''Run''' button to '''run''' the program.
+
|Let's click on '''Run''' button to '''run''' the program.
  
 
|-
 
|-
−
|| 04:53
+
|04:53
 
|Enter 45 for angle value and click '''OK'''.
 
|Enter 45 for angle value and click '''OK'''.
  
 
|-
 
|-
−
|| 04:57
+
|04:57
 
|Program runs without errors.
 
|Program runs without errors.
 +
 
|-
 
|-
−
|| 05:00
+
|05:00
−
||Let's remove one of the quotes of the '''string'''.  
+
|Let's remove one of the quotes of the '''string'''.  
 +
 
 
|-
 
|-
−
||05:05
+
|05:05
−
|| I will copy the program from text editor and paste it into KTurtle's editor.  
+
|I will copy the program from text editor and paste it into KTurtle's editor.  
 +
 
 
|-
 
|-
−
|| 05:12
+
|05:12
−
||Click on  '''Run''' button to '''run''' the program.
+
|Click on  '''Run''' button to '''run''' the program.
  
 
|-
 
|-
−
|| 05:15
+
|05:15
 
|Complier shows the following error:
 
|Complier shows the following error:
  
 
|-
 
|-
−
|| 05:18
+
|05:18
 
|'Text string was not properly closed, expected a double quote (") to close the string'.
 
|'Text string was not properly closed, expected a double quote (") to close the string'.
 +
 
|-
 
|-
−
|| 05:25
+
|05:25
−
||Here, the error is in line number 2.  
+
|Here, the error is in line number 2.  
 +
 
 
|-
 
|-
−
||05:29
+
|05:29
−
|| I will  go  back to line number 2 and replace the quotes.  
+
|I will  go  back to line number 2 and replace the quotes.  
 +
 
 
|-
 
|-
−
||  05:34
+
|05:34
−
||I will copy the program from text editor and paste it into Kturtle's editor.  
+
|I will copy the program from text editor and paste it into Kturtle's editor.  
 +
 
 
|-
 
|-
−
|| 05:41
+
|05:41
−
||Click on '''Run''' button to run the program.
+
|Click on '''Run''' button to run the program.
  
 
|-
 
|-
−
|| 05:44
+
|05:44
−
||Enter '45' for angle value and click '''OK'''.
+
|Enter '45' for angle value and click '''OK'''.
  
 
|-
 
|-
−
|| 05:49
+
|05:49
 
|Program runs without errors.  
 
|Program runs without errors.  
  
 
|-
 
|-
−
|| 05:52
+
|05:52
 
|This way you can find the line at which error has occurred and also correct it.  
 
|This way you can find the line at which error has occurred and also correct it.  
 +
 
|-
 
|-
−
||05:59
+
|05:59
−
||Let's now learn about '''run time''' errors.
+
|Let's now learn about '''run time''' errors.
 +
 
 
|-
 
|-
−
|| 06:04
+
|06:04
−
||'''Run-time error''' occurs during the '''execution''' of a program.  
+
|'''Run-time error''' occurs during the '''execution''' of a program.  
  
 
|-
 
|-
−
|| 06:10
+
|06:10
 
|It may '''crash''' the program when you '''run''' it.  
 
|It may '''crash''' the program when you '''run''' it.  
  
 
|-
 
|-
−
|| 06:15
+
|06:15
 
|'''Runtime errors''' are commonly due to wrong '''input''' from the user.  
 
|'''Runtime errors''' are commonly due to wrong '''input''' from the user.  
  
 
|-
 
|-
−
|| 06:23
+
|06:23
 
|Compiler cannot find these '''errors'''.
 
|Compiler cannot find these '''errors'''.
  
 
|-
 
|-
−
|| 06:27
+
|06:27
 
|For example:
 
|For example:
 +
 
|-
 
|-
−
|| 06:29
+
|06:29
−
|* Trying to divide by a '''variable''' that contains no value.
+
|Trying to divide by a '''variable''' that contains no value.
  
 
|-
 
|-
−
|| 06:31
+
|06:31
−
|* Run a '''loop''' without a terminating '''condition''' or '''increment value'''.
+
|Run a '''loop''' without a terminating '''condition''' or '''increment value'''.
 +
 
 
|-
 
|-
−
||06:43
+
|06:43
−
||I will clear the current program from the editor.
+
|I will clear the current program from the editor.
  
 
|-
 
|-
−
|| 06:47
+
|06:47
 
|Type "clear" command and '''Run''' to clean the canvas.
 
|Type "clear" command and '''Run''' to clean the canvas.
 +
 
|-
 
|-
−
|| 06:52
+
|06:52
−
||I already have a program in a text editor.  
+
|I already have a program in a text editor.  
  
 
|-
 
|-
−
|| 06:56
+
|06:56
 
|This program divides two numbers.
 
|This program divides two numbers.
  
 
|-
 
|-
−
|| 07:00
+
|07:00
 
|'a' is''' dividend''' and 'r' is '''divisor'''.  
 
|'a' is''' dividend''' and 'r' is '''divisor'''.  
 +
 
|-
 
|-
−
||07:04   
+
|07:04   
−
||I will copy the program from text editor and paste it into KTurtle's editor.  
+
|I will copy the program from text editor and paste it into KTurtle's editor.  
  
 
|-
 
|-
−
|| 07:11
+
|07:11
 
|Pause the tutorial here and type the program into your KTurtle editor.  
 
|Pause the tutorial here and type the program into your KTurtle editor.  
  
 
|-
 
|-
−
|| 07:16
+
|07:16
 
|Resume the tutorial after typing the program.  
 
|Resume the tutorial after typing the program.  
 +
 
|-
 
|-
−
|| 07:20
+
|07:20
−
||Let us click on  '''Run''' button to '''run''' the program.  
+
|Let us click on  '''Run''' button to '''run''' the program.  
  
 
|-
 
|-
−
|| 07:24
+
|07:24
 
|Let's enter '5' for 'a' and click '''OK''',
 
|Let's enter '5' for 'a' and click '''OK''',
  
 
|-
 
|-
−
|| 07:29
+
|07:29
 
|enter '0' for 'r' and click '''OK'''.
 
|enter '0' for 'r' and click '''OK'''.
  
 
|-
 
|-
−
|| 07:33
+
|07:33
 
|Here, we get a ''' run time error:'''  
 
|Here, we get a ''' run time error:'''  
  
 
|-
 
|-
−
|| 07:36
+
|07:36
 
|“you tried to divide by zero”.
 
|“you tried to divide by zero”.
 +
 
|-
 
|-
−
|| 07:39
+
|07:39
−
||This error is in line number 4.
+
|This error is in line number 4.
 +
 
 
|-
 
|-
−
|| 07:43
+
|07:43
−
||This error occurs as we cannot divide a number with zero.
+
|This error occurs as we cannot divide a number with zero.
 +
 
 
|-
 
|-
−
|| 07:49
+
|07:49
−
||Let us '''run''' again.  
+
|Let us '''run''' again.  
  
 
|-
 
|-
−
|| 07:51
+
|07:51
 
|Enter '5' for 'a' and click '''OK''',  
 
|Enter '5' for 'a' and click '''OK''',  
  
 
|-
 
|-
−
|| 07:54
+
|07:54
 
|enter '2' for 'r' and click '''OK'''.  
 
|enter '2' for 'r' and click '''OK'''.  
 +
 
|-
 
|-
−
|| 07:58
+
|07:58
 
|Program runs without errors.
 
|Program runs without errors.
 +
 
|-
 
|-
−
|| 08:01
+
|08:01
−
||I will clear the current program from KTurtle editor.
+
|I will clear the current program from KTurtle editor.
  
 
|-
 
|-
−
|| 08:05
+
|08:05
 
|Type "clear" command and '''Run''' to clean the canvas.
 
|Type "clear" command and '''Run''' to clean the canvas.
 +
 
|-
 
|-
−
||08:10
+
|08:10
−
||Next, we will learn about ''' logical errors'''.
+
|Next, we will learn about ''' logical errors'''.
 +
 
 
|-
 
|-
−
|| 08:14
+
|08:14
−
||'''Logical error''' is a mistake in a program's '''source code''' that results in incorrect or unexpected behavior.
+
|'''Logical error''' is a mistake in a program's '''source code''' that results in incorrect or unexpected behavior.
  
 
|-
 
|-
−
|| 08:26
+
|08:26
 
|For example-
 
|For example-
  
 
|-
 
|-
−
|| 08:28
+
|08:28
−
|* Assigning a value to a wrong variable.
+
|Assigning a value to a wrong variable.
  
 
|-
 
|-
−
|| 08:32
+
|08:32
−
|* Multiplying two numbers instead of adding.
+
|Multiplying two numbers instead of adding.
 +
 
 
|-
 
|-
−
||08:36
+
|08:36
−
||I already have a program in a text editor.  
+
|I already have a program in a text editor.  
 +
 
 
|-
 
|-
−
||  08:39
+
|08:39
−
||I will copy the program from text editor and paste it into Kturtle's editor.  
+
|I will copy the program from text editor and paste it into Kturtle's editor.  
  
 
|-
 
|-
−
|| 08:47
+
|08:47
 
|Pause the tutorial here and type the program into your KTurtle editor.  
 
|Pause the tutorial here and type the program into your KTurtle editor.  
  
 
|-
 
|-
−
|| 08:52
+
|08:52
 
|Resume the tutorial after typing the program.  
 
|Resume the tutorial after typing the program.  
 +
 
|-
 
|-
−
|| 08:57
+
|08:57
−
||Now click on the '''Run''' button to '''run''' the program.  
+
|Now click on the '''Run''' button to '''run''' the program.  
  
 
|-
 
|-
−
|| 09:01
+
|09:01
−
||A dialog-box pops-up; let's click '''OK'''.
+
|A dialog-box pops-up; let's click '''OK'''.
  
 
|-
 
|-
−
|| 09:05
+
|09:05
−
||Loop goes into an '''infinite loop'''.  
+
|Loop goes into an '''infinite loop'''.  
 +
 
 
|-
 
|-
−
||  09:08
+
|09:08
−
||We see that “while” loop prints numbers from 31 and is still printing.
+
|We see that “while” loop prints numbers from 31 and is still printing.
  
 
|-
 
|-
−
|| 09:15
+
|09:15
−
||This is a '''logical error'''.
+
|This is a '''logical error'''.
  
 
|-
 
|-
−
|| 09:18
+
|09:18
−
||In the “while” condition 'x' is greater than 20
+
|In the “while” condition 'x' is greater than 20
  
 
|-
 
|-
−
|| 09:23
+
|09:23
−
||but the variable 'x' is always greater than 20.
+
|but the variable 'x' is always greater than 20.
  
 
|-
 
|-
−
|| 09:28
+
|09:28
−
||So, the loop never terminates.
+
|So, the loop never terminates.
 +
 
 
|-
 
|-
−
|| 09:31
+
|09:31
−
||I will click on '''Abort''' button to abort the process.  
+
|I will click on '''Abort''' button to abort the process.  
 +
 
 
|-
 
|-
−
|| 09:36
+
|09:36
−
||Let's change $x=$x+1 to $x=$x-1.  
+
|Let's change $x=$x+1 to $x=$x-1.  
 +
 
 
|-
 
|-
−
||09:44
+
|09:44
−
|| I will copy the program from text editor and paste it into KTurtle's editor.
+
|I will copy the program from text editor and paste it into KTurtle's editor.
 +
 
 
|-  
 
|-  
−
|| 09:51
+
|09:51
−
||Let's click on '''Run''' button to run the program.  
+
|Let's click on '''Run''' button to run the program.  
  
 
|-
 
|-
−
|| 09:55
+
|09:55
−
||A dialog-box pops up. Let us click '''OK'''.
+
|A dialog-box pops up. Let us click '''OK'''.
  
 
|-
 
|-
−
|| 09:59
+
|09:59
−
||Loop terminates after printing the values from 29 to 20.  
+
|Loop terminates after printing the values from 29 to 20.  
 +
 
 
|-
 
|-
−
||10:05
+
|10:05
−
||With this, we come to the end of this tutorial.
+
|With this, we come to the end of this tutorial.
  
 
|-
 
|-
−
|| 10:10
+
|10:10
−
||Let us summarize.
+
|Let us summarize.
 +
 
 
|-
 
|-
−
|| 10:12
+
|10:12
−
||In this tutorial, we have learnt errors and types of errors such as-
+
|In this tutorial, we have learnt errors and types of errors such as-
  
 
|-
 
|-
−
|| 10:18
+
|10:18
−
|* Use of variable that has not been declared.
+
|Use of variable that has not been declared.
  
 
|-
 
|-
−
|| 10:23
+
|10:23
−
|* Missing '''quotes''' in '''string'''s.
+
|Missing '''quotes''' in '''string'''s.
  
 
|-
 
|-
−
|| 10:27
+
|10:27
−
|* '''Runtime errors''' and
+
|''Runtime errors''' and
  
 
|-
 
|-
−
|| 10:30
+
|10:30
−
||* '''Logical errors'''.
+
|'''Logical errors'''.As an assignment, I would like you to find errors in the given programs.
−
|-
+
−
|| 10:31
+
−
||As an assignment, I would like you to find errors in the given programs.
+
 
   
 
   
 
|-
 
|-
Line 474: Line 532:
 
||Watch the video available at this URl:
 
||Watch the video available at this URl:
 
http://spoken-tutorial.org/What_is_a_Spoken-Tutorial  
 
http://spoken-tutorial.org/What_is_a_Spoken-Tutorial  
 +
 
|-
 
|-
−
|| 10:50
+
|10:50
 
|It summarizes the Spoken Tutorial project.  
 
|It summarizes the Spoken Tutorial project.  
 +
 
|-
 
|-
−
|| 10:54
+
|10:54
 
|If you do not have good bandwidth, you can download and watch it.  
 
|If you do not have good bandwidth, you can download and watch it.  
 +
 
|-
 
|-
−
||10:59
+
|10:59
−
||The Spoken Tutorial Project team :
+
|The Spoken Tutorial Project team :Conducts workshops using spoken tutorials.
  
 
|-
 
|-
−
|| 11:01
+
|11:05
−
|* Conducts workshops using spoken tutorials.
+
|Gives certificates to those who pass an online test.  
−
|-
+
 
−
|| 11:05
+
−
|* Gives certificates to those who pass an online test.  
+
 
|-
 
|-
−
|| 11:09
+
|11:09
 
|For more details, please write to:
 
|For more details, please write to:
 
contact@spoken-tutorial.org
 
contact@spoken-tutorial.org
 +
 
|-
 
|-
−
|| 11: 17
+
|11:17
−
||'''Spoken Tutorial''' project is a part of the '''Talk to a Teacher''' project.  
+
|'''Spoken Tutorial''' project is a part of the '''Talk to a Teacher''' project.  
  
 
|-
 
|-
−
|| 11:23
+
|11:23
 
|It is supported by the National Mission on Education through ICT, MHRD, Government of India.  
 
|It is supported by the National Mission on Education through ICT, MHRD, Government of India.  
 
   
 
   
 
|-  
 
|-  
−
||11:31
+
|11:31
−
||More information on this mission is available at this link:
+
|More information on this mission is available at this link:
 
http://spoken-tutorial.org/NMEICT-Intro.  
 
http://spoken-tutorial.org/NMEICT-Intro.  
  
 
|-
 
|-
−
||11:37
+
|11:37
−
||This is Madhuri Ganpathi from '''IIT Bombay''', signing off.  
+
|This is Madhuri Ganpathi from '''IIT Bombay''', signing off.  
 +
 
 
|-
 
|-
−
||11:41  
+
|11:41  
−
||Thank you  for joining.
+
|Thank you  for joining.

Latest revision as of 18:39, 24 March 2017

Time Narration
00:01 Welcome to this tutorial on Common Errors in KTurtle.
00:07 In this tutorial, we will learn about:
00:10 Syntax errors
00:12 Run time errors and
00:14 Logical errors.
00:17 To record this tutorial, I am using:
00:20 Ubuntu Linux OS version 12.04
00:25 KTurtle version 0.8.1 beta.
00:31 We assume that you have basic working knowledge of KTurtle.
00:36 If not, for relevant tutorials, please visit our website:

http://spoken-tutorial.org

00:42 Let's first define- What is an error?
00:46 Error is a mistake in a program that produces an incorrect or unexpected result.
00:55 First, I will explain about types of errors.
01:00 Syntax error is a violation of grammatical rules of a programming language.
01:09 Compilation fails when a program has syntax errors.
01:15 Syntax errors are easy to find and fix.
01:22 For Example:,Unmatched parentheses, square and curly braces.
01:29 Use of variable that has not been declared.
01:34 Missing quotes in strings.
01:38 Let's open a new KTurtle Application.
01:42 Click on Dash home. In the Search bar, type: "kturtle".
01:48 Click on the KTurtle icon.
01:51 Let's begin the tutorial with some types of syntax errors.
01:58 I already have a program in a text-editor.
02:02 To explain the error in the program, I will comment part of the code.
02:09 Here, I will comment the line.
02:11 $a=ask within double quotes "enter any number and click Ok".
02:19 I will use hash(#) sign to comment the line.
02:23 I will copy the program from text-editor and paste it into Kturtle's editor.
02:31 Pause the tutorial here and type the program into your KTurtle editor.
02:37 Resume the tutorial after typing the program.
02:42 Let's click on Run button to run the program.
02:47 Compiler shows the following error:
02:50 "variable '$a' was used without first being assigned to a value".
02:57 Here, the error is in line number 4.
03:02 This is a syntax error. It occurred as the variable 'a' was not declared.
03:10 So, I will go to line number 2, remove the comment.
03:14 I will copy the program from text-editor and paste it into KTurtle's editor.
03:23 Let's click on Run button to run the program.
03:27 Enter '6' for 'a' value and click OK.
03:31 Program runs without errors.
03:35 I will clear the current program from KTurtle editor.
03:38 Type "clear" command and Run to clean the canvas.
03:43 Let's next look at another error.
03:46 I already have a program in a text-editor.
03:50 Here, the value of "pi" is predefined in KTurtle.
03:54 Let's delete the '$' sign in the program.
03:58 I will copy the program from text editor and paste it into Kturtle's Editor.
04:05 Pause the tutorial here and type the program into your KTurtle editor.
04:11 Resume the tutorial after typing the program.
04:16 Let's click on Run button to run the program.
04:19 Complier shows the following error:
04:22 "You cannot put '=' here".
04:26 This error is in line number 2.
04:30 This is a syntax error. It occurred as there is no container of variable.
04:37 Let's go back to the program, replace the '$' sign.
04:41 I will copy the program from text editor and paste it into KTurtle's editor.
04:49 Let's click on Run button to run the program.
04:53 Enter 45 for angle value and click OK.
04:57 Program runs without errors.
05:00 Let's remove one of the quotes of the string.
05:05 I will copy the program from text editor and paste it into KTurtle's editor.
05:12 Click on Run button to run the program.
05:15 Complier shows the following error:
05:18 'Text string was not properly closed, expected a double quote (") to close the string'.
05:25 Here, the error is in line number 2.
05:29 I will go back to line number 2 and replace the quotes.
05:34 I will copy the program from text editor and paste it into Kturtle's editor.
05:41 Click on Run button to run the program.
05:44 Enter '45' for angle value and click OK.
05:49 Program runs without errors.
05:52 This way you can find the line at which error has occurred and also correct it.
05:59 Let's now learn about run time errors.
06:04 Run-time error occurs during the execution of a program.
06:10 It may crash the program when you run it.
06:15 Runtime errors are commonly due to wrong input from the user.
06:23 Compiler cannot find these errors.
06:27 For example:
06:29 Trying to divide by a variable that contains no value.
06:31 Run a loop without a terminating condition or increment value.
06:43 I will clear the current program from the editor.
06:47 Type "clear" command and Run to clean the canvas.
06:52 I already have a program in a text editor.
06:56 This program divides two numbers.
07:00 'a' is dividend and 'r' is divisor.
07:04 I will copy the program from text editor and paste it into KTurtle's editor.
07:11 Pause the tutorial here and type the program into your KTurtle editor.
07:16 Resume the tutorial after typing the program.
07:20 Let us click on Run button to run the program.
07:24 Let's enter '5' for 'a' and click OK,
07:29 enter '0' for 'r' and click OK.
07:33 Here, we get a run time error:
07:36 “you tried to divide by zero”.
07:39 This error is in line number 4.
07:43 This error occurs as we cannot divide a number with zero.
07:49 Let us run again.
07:51 Enter '5' for 'a' and click OK,
07:54 enter '2' for 'r' and click OK.
07:58 Program runs without errors.
08:01 I will clear the current program from KTurtle editor.
08:05 Type "clear" command and Run to clean the canvas.
08:10 Next, we will learn about logical errors.
08:14 Logical error is a mistake in a program's source code that results in incorrect or unexpected behavior.
08:26 For example-
08:28 Assigning a value to a wrong variable.
08:32 Multiplying two numbers instead of adding.
08:36 I already have a program in a text editor.
08:39 I will copy the program from text editor and paste it into Kturtle's editor.
08:47 Pause the tutorial here and type the program into your KTurtle editor.
08:52 Resume the tutorial after typing the program.
08:57 Now click on the Run button to run the program.
09:01 A dialog-box pops-up; let's click OK.
09:05 Loop goes into an infinite loop.
09:08 We see that “while” loop prints numbers from 31 and is still printing.
09:15 This is a logical error.
09:18 In the “while” condition 'x' is greater than 20
09:23 but the variable 'x' is always greater than 20.
09:28 So, the loop never terminates.
09:31 I will click on Abort button to abort the process.
09:36 Let's change $x=$x+1 to $x=$x-1.
09:44 I will copy the program from text editor and paste it into KTurtle's editor.
09:51 Let's click on Run button to run the program.
09:55 A dialog-box pops up. Let us click OK.
09:59 Loop terminates after printing the values from 29 to 20.
10:05 With this, we come to the end of this tutorial.
10:10 Let us summarize.
10:12 In this tutorial, we have learnt errors and types of errors such as-
10:18 Use of variable that has not been declared.
10:23 Missing quotes in strings.
10:27 Runtime errors' and
10:30 Logical errors.As an assignment, I would like you to find errors in the given programs.
10:46 Watch the video available at this URl:

http://spoken-tutorial.org/What_is_a_Spoken-Tutorial

10:50 It summarizes the Spoken Tutorial project.
10:54 If you do not have good bandwidth, you can download and watch it.
10:59 The Spoken Tutorial Project team :Conducts workshops using spoken tutorials.
11:05 Gives certificates to those who pass an online test.
11:09 For more details, please write to:

contact@spoken-tutorial.org

11:17 Spoken Tutorial project is a part of the Talk to a Teacher project.
11:23 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
11:31 More information on this mission is available at this link:

http://spoken-tutorial.org/NMEICT-Intro.

11:37 This is Madhuri Ganpathi from IIT Bombay, signing off.
11:41 Thank you for joining.
Retrieved from "https://script.spoken-tutorial.org/index.php?title=KTurtle/C3/Common-Errors-in-KTurtle/English-timed&oldid=34162"