PHP-and-MySQL/C2/Functions-Advanced/English-timed - Revision history

Sandhya.np14 at 17:09, 25 May 2015

2015-05-25T17:09:09Z

Sandhya.np14 at 15:36, 25 May 2015

2015-05-25T15:36:03Z

Sandhya.np14 at 07:12, 21 May 2015

2015-05-21T07:12:09Z

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Pratik kamble at 06:04, 10 July 2014

2014-07-10T06:04:10Z

Pratik kamble at 06:02, 10 July 2014

2014-07-10T06:02:29Z

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Sneha at 06:22, 7 August 2013

2013-08-07T06:22:38Z

Minal: Created page with '{| border=1 !Time !Narration |- |0:02 |Welcome to the Spoken Tutorial on Advanced Function. Here, I'll show you how to create a little calculator program. |- |0:11 |We will deal …'

2013-01-02T10:31:06Z

Created page with '{| border=1 !Time !Narration |- |0:02 |Welcome to the Spoken Tutorial on Advanced Function. Here, I'll show you how to create a little calculator program. |- |0:11 |We will deal …'

New page

{| border=1
!Time
!Narration
|-
|0:02
|Welcome to the Spoken Tutorial on Advanced Function. Here, I'll show you how to create a little calculator program.
|-
|0:11
|We will deal with a function that allows you to input a value. Then gain a value out of this, after a mathematical operation
|-
|0:19
|So, we'll create a function in the same way that we've done before. I'll call this 'calc'
|-
|0:26
|And I'm going to create my first block . Here , I'll type 'number1', 'number2' and an 'operator'
|-
|0:35
|Now this will be a numerical value. This will be an integer or decimal, depending on the user-input. This will also be the same and this will be the string value of either 'add' 'subtract' 'multiply' or 'divide'
|-
|0:52
|Now inside our function we need to start creating our code. I'm going to create a switch statement inside.
|-
|01:00
|I'll say switch and put the switch condition or rather the input of the switch is 'op'
|-
|1:08
|I'll create a block for this and I'll say case = plus then carry out this.
|-
|1:18
|I'll make a new variable called 'total' which will be equal to 'num1' which is input here plus 'num2'
|-
|1:31
|I'll break that with a semicolon. Now there's probability a much easier way to do this by combining the switch statement with a function.
|-
|1:43
|So you will be able to use all different kinds of things inside other statements and inside functions.
|-
|1:51
|So I have created a case for 'plus'. So when this equals to 'plus' supplied by the user, we have 'num1' added to 'num2'.
|-
|2:03
|Now we need to go down and create another 'case', which is 'minus'. I'll type total = 'num1' - 'num2'
|-
|2:17
| We will scroll down. Make sure you break that.
|-
|2:20
|We'll now copy this code down.
|-
|2:23
|And here we'll say 'multiply' and we'll say 'divide' and make sure you change the sign here.
|-
|2:34
|Now if you don't understand what is going on please feel free to contact us via e-mail. I hope every confusion will be resolved in that way.
|-
|2:45
|In the default we're going to echo out 'unknown operator'. OK?
|-
|2:51
|Let me just run through this. Then we will start to call the function.
|-
|2:56
|I have got a function called calculator or calc for short, which takes a number as input, then a second number and then an operator which could be either 'plus' 'minus' 'multiply' or 'divide'.
|-
|3:12
| As you have probably seen in my mathematical operator - sorry in my arithmetic operator tutorial.
|-
|3:20
|Now we have a switch statement inside, which takes this 'op' into account. It takes what has been entered. Now if it equals to a 'plus', remember that it switches over to this statement. It is easier to write and much more efficient.
|-
|3:42
|If it equals to a 'plus' then we will create a new variable called 'total'.
|-
|3:48
|That's going to be equal to the first number which was entered and added to the second number which was entered.
|-
|3:56
|Here we will say if it's a 'minus', then the variable 'total' - okay remember, the variable 'total' will only be set once for each case either plus or minus - so this total variable going to be number 1 - number 2 and the same for multiply and divide as well.
|-
|4:21
|Now this would do absolutely nothing. Refresh this. Now, if we enter this page, there is nothing, because we haven't called our function.
|-
|4:32
|Now to call our function, as you know, we will just say calc and put our values in.
|-
|4:40
|Let's us just give it two numbers say 10 and 10 and a 'plus' . Okay, so that will be 20. Now watch what happens if I refresh this. Nothing. Now why?
|-
|4:55
|The reason is that we haven't echoed this out. We've just set it as a variable.
|-
|5:01
|So what we would ideally do is we will echo what has been out put from calc. Now, at the moment this won't do anything if we do a refresh
|-
|5:11
|We have got nothing, because, there is no return output. So, in each case what we should say is 'return total'.
|-
|5:23
|What this does is - If you think of the function as a variable it sets the function's value as the total.
|-
|5:32
|As long as you say return whatever you say here the function will equal that.
|-
|5:39
|So we are going to say return total and we are going to copy that and paste it down for each case.
|-
|5:47
|Okay so obviously we don't need to do that for unknown operator. This is because, there is no operator to be found here.
|-
|5:57
|And we can refresh that.
|-
|6:00
|We still don't have anything. Guess why?
|-
|6:04
|The reason this is not working is because I've echoed this inside a function. That's a mistake.
|-
|6:10
|You can see the bracket of a function that starts here and ends here
|-
|6:14
|I'll place this underneath here, where it should be and then refresh it. It's 20 okay, we can see the 10 + 10 is 20 through our function
|-
|6:37
|So let's pick some different values, say, 13 and 7 and divide. Let's see what we get.
|-
|6:46
|Okay, we have got a quiet long decimal number. So you can see that this is quite good function that we have made. We have got our first number, our second number and an operator.
|-
|6:59
|And through a switch statement it detects which one and performs the relevant operation to it.
|-
|7:06
|An unknown operator error will be given if it can't be determined.
|-
|7:11
|So, for example let's take 'a' which is not a valid operator. As soon as we refresh it's going to unknown operator. This brings us to the end of the tutorial on advanced functions. We saw that we can input a value and then returned a value echoing out using a return command.
|-
|7:31
|This is Sidharth dubbing for the Spoken Tutorial Project. Thanks for watching.
|-

@@ Line 28: / Line 28: @@
 |-
 |01:18
-|I'll make a new variable called '''total''' which will be equal to 'num1' which is input here plus 'num2'.
+|I'll make a new variable called '''$total''' which will be equal to 'num1' which is input here plus 'num2'.
 |-
 |01:32
-|I'll '''break''' that with a semicolon.  Now there's probability a much easier way to do this by combining the '''switch statement''' with a '''function'''.
+|I'll '''break''' that with a semicolon.  Now there's a probability, a much easier way to do this by combining the '''switch''' statement with a function.
 |-
 |01:44
@@ Line 37: / Line 37: @@
 |-
 |01:52
-|So I have created a '''case''' for 'plus'. So when this equals to 'plus' supplied by the user, we have 'num1' added to 'num2'.
+|So I have created a '''case''' for 'plus'. So when this equals to 'plus' supplied by the user, we have '$num1' added to '$num2'.
 |-
 |02:03
-|Now we need to go down and create another '''case''', which is 'minus'. I'll type '''total = 'num1' - 'num2''''.
+|Now we need to go down and create another '''case''' which is 'minus'. I'll type '''$total = $num1 - $num2;'''
 |-
 |02:17
-| We will scroll down. Make sure you break that.
+| We will scroll down; make sure you break that.
 |-
 |02:21
@@ Line 49: / Line 49: @@
 |-
 |02:24
-|And here we'll say 'multiply' and we'll say 'divide' and make sure you change the sign here.
+|And here, we'll say "*" (multiply) and we'll say "/" (divide) and make sure you change the sign here.
 |-
 |02:34
@@ Line 55: / Line 55: @@
 |-
 |02:45
-|In the default, we're going to '''echo''' out "unknown operator". OK?
+|In the default, we're going to '''echo''' out "Unknown operator". OK?
 |-
 |02:51
-|Let me just run through this. Then we will start to call the function.
+|Let me just run through this. Then we will start to '''call''' the '''function'''.
 |-
 |02:56
@@ Line 67: / Line 67: @@
 |-
 |03:20
-|Now we have a '''switch''' statement inside which takes this 'op' into account. It takes what has been entered. Now if it equals to a 'plus', remember that it switches over to this statement. It is easier to write and much more efficient.
+|Now we have a '''switch''' statement inside which takes this '''$op''' into account. It takes what has been entered. Now if it equals to a 'plus'(+), remember that it switches over to this statement. It is easier to write and much more efficient.
 |-
 |03:42
-|If it equals to a 'plus' then we will create a new variable called 'total'.
+|If it equals to a "+" (plus) then we will create a new variable called 'total'.
 |-
 |03:48
@@ Line 76: / Line 76: @@
 |-
 |03:56
-|Here we will say if it's a 'minus' then the variable 'total' - okay remember, the variable 'total' will only be set once for each '''case''' either plus or minus - so this '''total''' variable going to be number 1 - number 2 and the same for multiply and divide as well.
+|Here, we will say if it's a "-" (minus) then the variable 'total' - okay remember, the variable 'total' will only be set once for each '''case''' either plus or minus,  so this '''$total''' variable going to be number1 - number2 and the same for multiply and divide as well.
 |-
 |04:21
@@ Line 82: / Line 82: @@
 |-
 |04:33
-|Now to call our '''function''', as you know, we will just say '''calc''' and put our values in.
+|Now to call our '''function''', as you know, we will just say '''calc();''' and put our values in.
 |-
 |04:40
-|Let us just give it two numbers say 10 and 10 and a 'plus' . Okay, so that will be 20. Now watch what happens if I '''refresh''' this. Nothing. Now why?
+|Let us just give it two numbers say 10 and 10 and a "+" (plus). Okay, so that will be 20. Now watch what happens if I '''refresh''' this. Nothing. Now why?
 |-
 |04:55
@@ Line 91: / Line 91: @@
 |-
 |05:01
-|So, what we would ideally do is we will echo what has been '''output''' from '''calc'''. Now, at the moment this won't do anything if we do a '''refresh'''.
+|So, what we ideally do is, we will echo what has been '''output''' from '''calc'''. Now, at the moment this won't do anything if we do a '''refresh'''.
 |-
 |05:11
-|We have got nothing because there is no return output. So, in each case what we should say is '''return total'''.
+|We have got nothing because there is no return output. So, in each case, we should say '''return''' '''$total;'''.
 |-
 |05:24
-|What this does is - if you think of the function as a variable, it sets the function's value as the '''total'''.
+|What this does is - if you think of the function as a variable, it sets the function's value as the '''$total'''.
 |-
 |05:32
-|As long as you say '''return''' whatever you say here the function will equal that.
+|As long as you say '''return''', whatever you say here, the function will equal that.
 |-
 |05:39
-|So, we are going to say '''return total''' and we are going to copy that and paste it down for each '''case'''.
+|So, we are going to say '''return $total''' and we are going to copy that and paste it down for each '''case'''.
 |-
 |05:47
-|Okay. So, obviously we don't need to do that for unknown operator. This is because there is no operator to be found here.
+|Okay. So, obviously we don't need to do that for "Unknown operator". This is because there is no operator to be found here.
 |-
 |05:58
@@ Line 121: / Line 121: @@
 |-
 |06:15
-|I'll place this underneath here where it should be and then '''refresh''' it. It's 20 okay, we can see the 10 + 10 is 20 through our function.
+|I'll place this underneath here where it should be and then '''refresh''' it. It's 20. okay, we can see the 10 + 10 is 20 through our function.
 |-
 |06:37
@@ Line 133: / Line 133: @@
 |-
 |07:06
-|An unknown operator error will be given if it can't be determined.
+|An "Unknown operator" error will be given if it can't be determined.
 |-
 |07:11
-|So, for example let's take 'a' which is not a valid operator. As soon as we refresh, it's going to unknown operator. This brings us to the end of the tutorial on '''Advanced Functions'''. We saw that we can input a value and then returned a value echoing out using a '''return''' command.
+|So, for example let's take "a" which is not a valid operator. As soon as we refresh, it's going to  unknown operator. This brings us to the end of the tutorial on '''Advanced Functions'''. We saw that we can '''input''' a value and then returned a value echoing out using a '''return''' command.
 |-
 |07:31
 |This is Sidharth, dubbing for the Spoken Tutorial Project. Thanks for watching.
 |-

@@ Line 7: / Line 7: @@
 |-
 |00:11
-|We will deal with a '''function''' that allows you to '''input''' a value.  Then gain a value out of this, after a mathematical operation.
+|We will deal with a '''function''' that allows you to '''input''' a value, then gain a value out of this after a mathematical operation.
 |-
 |00:20
@@ Line 22: / Line 22: @@
 |-
 |01:00
-|I'll say '''switch''' and put the '''switch condition''' or rather the input of the switch is 'op'.
+|I'll say '''switch''' and put the '''switch condition''' or rather the input of the switch is '''$op'''.
 |-
 |01:09
-|I'll create a '''block''' for this and I'll say '''case =''' plus (+) then carry out this.
+|I'll create a '''block''' for this and I'll say '''case''' "+" (plus) then carry out this.
 |-
 |01:18

@@ Line 1: / Line 1: @@
 {| border=1
-!Time
+|'''Time'''
-!Narration
+|'''Narration'''
 |-
 |00:03

@@ Line 3: / Line 3: @@
 !Narration
 |-
-|0:02
+|0:03
 |Welcome to the Spoken Tutorial on Advanced Function. Here, I'll show you how to create a little calculator program.
 |-
@@ Line 9: / Line 9: @@
 |We will deal with a function that allows you to input a value.  Then gain a value out of this, after a mathematical operation
 |-
-|0:19
+|0:20
 |So, we'll create a function in the same way that we've done before. I'll call this 'calc'
 |-
-|0:26
+|0:27
 |And I'm going to create my first block . Here , I'll type  'number1', 'number2' and an 'operator'
 |-
@@ Line 24: / Line 24: @@
 |I'll say switch and put the switch condition or rather the input of the switch is 'op'
 |-
-|1:08
+|1:09
 |I'll create a block for this and I'll say case = plus then carry out this.
 |-
@@ Line 30: / Line 30: @@
 |I'll make a new variable called 'total' which will be equal to 'num1' which is input here plus 'num2'
 |-
-|1:31
+|1:32
 |I'll break that with a semicolon.  Now there's probability a much easier way to do this by combining the switch statement with a function.
 |-
-|1:43
+|1:44
 |So you will be able to use all different kinds of things inside other statements and inside functions.
 |-
-|1:51
+|1:52
 |So I have created a case for 'plus'. So when this equals to 'plus' supplied by the user, we have 'num1' added to 'num2'.
 |-
@@ Line 45: / Line 45: @@
 | We will scroll down. Make sure you break that.
 |-
-|2:20
+|2:21
 |We'll now copy this code down.
 |-
-|2:23
+|2:24
 |And here we'll say 'multiply' and we'll say 'divide' and make sure you change the sign here.
 |-
@@ Line 81: / Line 81: @@
 |Now this would do absolutely nothing. Refresh this. Now, if we enter this page, there is nothing, because we haven't called our function.
 |-
-|4:32
+|4:33
 |Now to call our function, as you know, we will just say calc and put our values in.
 |-
@@ Line 96: / Line 96: @@
 |We have got nothing, because, there is no return output. So, in each case what we should say is 'return total'.
 |-
-|5:23
+|5:24
 |What this does is - If you think of the function as a variable it sets the function's value as the total.
 |-
@@ Line 108: / Line 108: @@
 |Okay so obviously we don't need to do that for unknown operator. This is because, there is no operator to be found here.
 |-
-|5:57
+|5:58
 |And we can refresh that.
 |-
@@ Line 120: / Line 120: @@
 |You can see the bracket of a function that starts here and ends here
 |-
-|6:14
+|6:15
 |I'll place this underneath here, where it should be and then refresh it. It's 20 okay, we can see the 10 + 10 is 20 through our function
 |-
@@ Line 129: / Line 129: @@
 |Okay, we have got a quiet long decimal number. So you can see that this is quite good function that we have made. We have got our first number, our second number and an operator.
 |-
-|6:59
+|7:00
 |And through a switch statement it detects which one and performs the relevant operation to it.
 |-