Difference between revisions of "C-and-C++/C2/Arithmetic-Operators/English-timed"
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{| border=1 | {| border=1 | ||
− | || ''Time''' | + | || '''Time''' |
|| '''Narration''' | || '''Narration''' | ||
− | |||
|- | |- | ||
− | |00 | + | |00:01 |
− | | Welcome to the spoken tutorial on '''Arithmetic Operators in C | + | | Welcome to the spoken tutorial on '''Arithmetic Operators in C And C++'''. |
|- | |- | ||
− | | 00 | + | | 00:07 |
− | | In this tutorial, we will learn about | + | | In this tutorial, we will learn about: |
|- | |- | ||
− | | 00 | + | | 00:10 |
− | |Arithmetic operators like | + | |Arithmetic operators like '+' Addition: e.g. a+b. |
− | + | ||
|- | |- | ||
− | | 00 | + | | 00:14 |
− | | | + | | '-' Subtraction: e.g. a-b. |
|- | |- | ||
− | | 00 | + | | 00:18 |
− | | | + | |'/' Division: e.g. a/b. |
|- | |- | ||
− | | 00 | + | | 00:20 |
− | | | + | | '*' Multiplication: e.g. a*b. |
|- | |- | ||
− | | 00 | + | | 00:24 |
− | + | |'%' Modulus: e.g. a%b. | |
− | + | ||
− | + | ||
− | + | ||
− | | % Modulus: | + | |
|- | |- | ||
− | | 00 | + | | 00:27 |
− | | To record this tutorial, I am using:'''Ubuntu 11.10''' as the operating system | + | | To record this tutorial, I am using: '''Ubuntu 11.10''' as the operating system |
|- | |- | ||
− | | 00 | + | | 00:32 |
|'''gcc''' and '''g++ Compiler version 4.6.1 in Ubuntu'''. | |'''gcc''' and '''g++ Compiler version 4.6.1 in Ubuntu'''. | ||
|- | |- | ||
− | |00 | + | |00:38 |
| I will now demonstrate the use of these arithmetic operations with the help of a '''C''' program. | | I will now demonstrate the use of these arithmetic operations with the help of a '''C''' program. | ||
|- | |- | ||
− | | 00 | + | | 00:44 |
| I have already written the program. | | I have already written the program. | ||
|- | |- | ||
− | | 00 | + | | 00:47 |
− | |So I will open the editor and explain the code. | + | |So, I will open the editor and explain the code. |
|- | |- | ||
− | | 00 | + | | 00:49 |
− | | | + | | Here is the C program for arithmetic operators. |
|- | |- | ||
− | | 00 | + | | 00:56 |
− | | the first two statements the variables are declared and defined. | + | | In the first two statements, the variables are declared and defined. |
|- | |- | ||
− | | 01 | + | | 01:02 |
|In the next two statements, | |In the next two statements, | ||
|- | |- | ||
− | | 01 | + | | 01:04 |
|'''a''' is assigned the value of 5. | |'''a''' is assigned the value of 5. | ||
|- | |- | ||
− | | 01 | + | | 01:06 |
|'''b''' is assigned the value of 2. | |'''b''' is assigned the value of 2. | ||
|- | |- | ||
− | | 01 | + | | 01:10 |
− | | | + | | Now let's see how the addition operator works. |
|- | |- | ||
− | | 01 | + | | 01:14 |
|'''c''' holds the sum of '''a''' and '''b'''. | |'''c''' holds the sum of '''a''' and '''b'''. | ||
|- | |- | ||
− | | 01 | + | | 01:19 |
| This '''printf''' statement displays the sum of a and b on the screen. | | This '''printf''' statement displays the sum of a and b on the screen. | ||
|- | |- | ||
− | | 01 | + | | 01:28 |
|Here % dot 2f provides the precision of two digits after the decimal point. | |Here % dot 2f provides the precision of two digits after the decimal point. | ||
|- | |- | ||
− | | 01 | + | | 01:37 |
| In the next statement, '''c''' holds the product of '''a''' and '''b'''. | | In the next statement, '''c''' holds the product of '''a''' and '''b'''. | ||
|- | |- | ||
− | | 01 | + | | 01:43 |
| This '''printf''' statement displays the product of a and b on the screen. | | This '''printf''' statement displays the product of a and b on the screen. | ||
|- | |- | ||
− | | 01 | + | | 01:48 |
|Let's see how these two operators work. | |Let's see how these two operators work. | ||
|- | |- | ||
− | | 01 | + | | 01:52 |
− | | We will comment out the following lines | + | | We will comment out the following lines. |
|- | |- | ||
− | | 01 | + | | 01:55 |
− | |Type '''/*''' | + | |Type '''/*''' (slash asterisk) |
|- | |- | ||
− | | 02 | + | | 02:01 |
− | | '' */ '' | + | | ''' */ ''' |
|- | |- | ||
− | | 02 | + | | 02:05 |
− | | Click on '''Save'' | + | | Click on '''Save'''. |
|- | |- | ||
− | | 02 | + | | 02:07 |
− | |Save the file with extension '''.c''' | + | |Save the file with extension '''.c''' (dot c). |
|- | |- | ||
− | | 02 | + | | 02:10 |
− | |I have saved my file as''' arithmetic.c''' | + | |I have saved my file as''' arithmetic.c'''. |
|- | |- | ||
− | | 02 | + | | 02:15 |
− | | | + | | Open the terminal window by pressing '''Ctrl, Alt''' and '''T''' keys simultaneously. |
|- | |- | ||
− | | 02 | + | | 02:22 |
| To compile the code, type the following on the terminal. | | To compile the code, type the following on the terminal. | ||
|- | |- | ||
− | | 02 | + | | 02:27 |
|'''gcc space arithmetic dot c space minus o space arith''' | |'''gcc space arithmetic dot c space minus o space arith''' | ||
|- | |- | ||
− | | 02 | + | | 02:38 |
− | |''' | + | |Press '''Enter'''. |
|- | |- | ||
− | | 02 | + | | 02:40 |
− | |To execute the code, type '''./arith''' | + | |To execute the code, type '''./arith''' (dot slash arith). |
|- | |- | ||
− | | | + | |02:48 |
− | | | + | |press '''Enter'''. |
|- | |- | ||
− | | | + | |02:50 |
− | | | + | |The output is displayed on the screen. |
|- | |- | ||
− | | 02 | + | | 02:53 |
− | |It shows, | + | |It shows,'''Sum of 5 and 2 is 7.00''' and |
|- | |- | ||
− | | 02 | + | | 02:59 |
− | | | + | |'''Product of 5and 2 is 10.00'''. |
|- | |- | ||
− | | | + | |03:03 |
− | | | + | |Now you should try the subtraction operator on your own. |
|- | |- | ||
− | | | + | | 03:08 |
− | + | ||
− | + | ||
− | + | ||
− | + | ||
|Try replacing the addition operator with subtraction operator. | |Try replacing the addition operator with subtraction operator. | ||
|- | |- | ||
− | | 03 | + | | 03:13 |
|You should get the result as 3. | |You should get the result as 3. | ||
|- | |- | ||
− | | 03 | + | | 03:18 |
| Coming back to the program and the last set of statements. | | Coming back to the program and the last set of statements. | ||
|- | |- | ||
− | | 03 | + | | 03:23 |
|Now, I will explain the code for division. | |Now, I will explain the code for division. | ||
|- | |- | ||
− | | 03 | + | | 03:26 |
− | |Remove the | + | |Remove the multiline comments here and here. |
|- | |- | ||
− | | | + | |03:34 |
− | | | + | |In these statements, '''c''' holds the value of integer division of '''a''' by '''b'''. |
|- | |- | ||
− | | 03 | + | | 03:40 |
|Please note that in integer division the fractional part is truncated. | |Please note that in integer division the fractional part is truncated. | ||
|- | |- | ||
− | | 03 | + | | 03:47 |
| The '''printf '''statement displays the division output on the screen. | | The '''printf '''statement displays the division output on the screen. | ||
|- | |- | ||
− | | 03 | + | | 03:57 |
| In this statement we are performing real division. | | In this statement we are performing real division. | ||
|- | |- | ||
− | | 04 | + | | 04:02 |
− | |Here one of the operands has to be cast as '''float''' | + | |Here one of the operands has to be cast as '''float'''. |
| | | | ||
|- | |- | ||
− | |04 | + | |04:10 |
| We have type-cast variable a. | | We have type-cast variable a. | ||
+ | |||
|- | |- | ||
− | | 04 | + | |04:13 |
− | |Now a will behave as a float variable for a single operation. | + | |Now '''a''' will behave as a float variable for a single operation. |
− | + | ||
− | + | ||
|- | |- | ||
− | | 04 | + | | 04:22 |
|The printf statement displays the output of real division on the screen. | |The printf statement displays the output of real division on the screen. | ||
− | |||
|- | |- | ||
− | |04 | + | |04:30 |
− | | Type '''return 0''' and close the ending curly bracket. | + | | Type '''return 0;''' and close the ending curly bracket. |
|- | |- | ||
− | | 04 | + | | 04:37 |
| Click on '''Save.''' | | Click on '''Save.''' | ||
|- | |- | ||
− | | | + | | 04:40 |
− | | | + | | Coming back to the terminal to compile and execute the code. |
|- | |- | ||
− | | 04 | + | | 04:45 |
− | | | To compile, type'''gcc space arithmetic dot c minus o space arith'''. Press Enter | + | | | To compile, type'''gcc space arithmetic dot c minus o space arith'''. Press Enter. |
|- | |- | ||
− | | 04 | + | | 04:59 |
− | |To execute the code, type '''./arith'''Press Enter | + | |To execute the code, type '''./arith'''. Press Enter. |
− | + | ||
|- | |- | ||
− | | | + | |05:05 |
− | | The output is displayed on the screen | + | |The output is displayed on the screen. |
|- | |- | ||
− | | 05 | + | |05:08 |
|We have the previous outputs of addition and multiplication operators. | |We have the previous outputs of addition and multiplication operators. | ||
− | |||
− | |||
− | |||
+ | |- | ||
+ | | 05:16 | ||
+ | |We have the integer Division of 5 by 2 is 2. | ||
|- | |- | ||
− | |05 | + | |05:22 |
|We can see that in integer division the fractional part is truncated. | |We can see that in integer division the fractional part is truncated. | ||
− | |||
|- | |- | ||
− | | 05 | + | | 05:29 |
− | | | + | |Then we have the real division of 5 by 2 is 2.5. |
|- | |- | ||
− | | 05 | + | | 05:35 |
− | |In real division the result is as expected. | + | |In real division, the result is as expected. |
|- | |- | ||
− | | 05 | + | | 05:37 |
− | |We used type-casting to obtain these | + | |We used type-casting to obtain these results. |
|- | |- | ||
− | | 05 | + | | 05:45 |
| Now suppose, I want to write the same program in C++. | | Now suppose, I want to write the same program in C++. | ||
|- | |- | ||
− | | 05 | + | | 05:50 |
− | |Let see if | + | |Let's see if I can use the same code in C++ too? |
|- | |- | ||
− | | 05 | + | | 05:54 |
| Let's find out. | | Let's find out. | ||
|- | |- | ||
− | | 05 | + | | 05:56 |
|Let me go back to the editor. | |Let me go back to the editor. | ||
|- | |- | ||
− | | 06 | + | | 06:00 |
− | | Here is a C++ | + | | Here is a C++ code. |
|- | |- | ||
− | | 06 | + | | 06:05 |
| Notice that the header is different from the C file header. | | Notice that the header is different from the C file header. | ||
|- | |- | ||
− | | 06 | + | | 06:12 |
|'''namespace''' is also used here. | |'''namespace''' is also used here. | ||
|- | |- | ||
− | | | + | |06:18 |
− | | | + | |Also, notice that the output statement in C++ is '''cout'''. |
|- | |- | ||
− | | | + | |06:25 |
− | | | + | |So, apart from these differences, the two codes are very similar. |
|- | |- | ||
− | | | + | |06:32 |
− | | Click on '''Save'''. | + | |Click on '''Save'''.Make sure the file is saved with the extension '''.cpp'''. |
|- | |- | ||
− | | 06 | + | | 06:37 |
− | | | + | |I have saved my file as''' arithmetic.cpp'''. |
|- | |- | ||
− | | 06 | + | | 06:41 |
− | + | ||
− | + | ||
− | + | ||
− | + | ||
| Let's execute the code and see what results we get. | | Let's execute the code and see what results we get. | ||
|- | |- | ||
− | | 06 | + | | 06:49 |
− | |Open the terminal and type '''g++ space arithmetic dot cpp space minus o arith'' .''' | + | |Open the terminal and type '''g++ space arithmetic dot cpp space minus o arith''' . Press '''Enter'''. |
|- | |- | ||
− | | 07 | + | | 07:09 |
− | | To execute the code | + | | To execute the code, type '''./ arith'''. Press '''Enter'''. |
− | + | ||
− | + | ||
|- | |- | ||
− | | 07 | + | | 07:16 |
− | | Here the output is displayed | + | | Here the output is displayed. |
|- | |- | ||
− | | 07 | + | | 07:19 |
|So, we see that the results are similar to the C program. | |So, we see that the results are similar to the C program. | ||
|- | |- | ||
− | | 07 | + | | 07:23 |
|The only difference is in the precisions of outputs. | |The only difference is in the precisions of outputs. | ||
|- | |- | ||
− | | | + | |07:29 |
− | | | + | |Let us now summarize the tutorial. |
|- | |- | ||
− | | 07 | + | | 07:32 |
|In this tutorial we learnt how to use the arithmetic operators. | |In this tutorial we learnt how to use the arithmetic operators. | ||
|- | |- | ||
− | | 07 | + | | 07:36 |
| As an assignment: | | As an assignment: | ||
|- | |- | ||
− | | 07 | + | | 07:38 |
|Write a program to demonstrate the use of modulus operator. | |Write a program to demonstrate the use of modulus operator. | ||
|- | |- | ||
− | | 07 | + | | 07:42 |
− | |Please note that Modulus operator finds the remainder of division. | + | |Please note that Modulus operator finds the remainder of division. e.g. c = a % b; |
|- | |- | ||
− | | 07 | + | | 07:50 |
|You should obtain the result as 1. | |You should obtain the result as 1. | ||
|- | |- | ||
− | | 07 | + | | 07:55 |
− | | Watch the video available at the following link | + | | Watch the video available at the following link. |
|- | |- | ||
− | | 07 | + | | 07:57 |
− | |It | + | |It summarizes the Spoken Tutorial project. |
|- | |- | ||
− | | 08 | + | | 08:00 |
− | |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. |
− | + | ||
− | + | ||
|- | |- | ||
− | | 08 | + | | 08:05 |
− | | The Spoken Tutorial Project Team | + | | The Spoken Tutorial Project Team: Conducts workshops using spoken tutorials. |
|- | |- | ||
− | | 08 | + | | 08:09 |
− | | Gives certificates | + | | Gives certificates to those who pass an online test. |
|- | |- | ||
− | | 08 | + | | 08:14 |
− | | For more details, please write to contact at spoken hyphen tutorial dot org | + | | For more details, please write to contact at spoken hyphen tutorial dot org. |
− | + | ||
|- | |- | ||
− | | 08 | + | | 08:20 |
− | | 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. |
|- | |- | ||
− | | 08 | + | | 08:25 |
− | | 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. |
− | + | |- | |
− | | 08 | + | | 08:30 |
| More information on this Mission is available at | | More information on this Mission is available at | ||
|- | |- | ||
− | | 08 | + | | 08:33 |
| spoken hyphen tutorial dot org slash NMEICT hyphen Intro | | spoken hyphen tutorial dot org slash NMEICT hyphen Intro | ||
− | |||
− | |||
|- | |- | ||
− | | 08 | + | | 08:41 |
− | | This is Ritwik Joshi from IIT Bombay. | + | | This is Ritwik Joshi from IIT Bombay. Thank you for joining. |
− | + | ||
− | Thank you for joining. | + | |
|} | |} |
Latest revision as of 14:18, 24 March 2017
Time | Narration | |
00:01 | Welcome to the spoken tutorial on Arithmetic Operators in C And C++. | |
00:07 | In this tutorial, we will learn about: | |
00:10 | Arithmetic operators like '+' Addition: e.g. a+b. | |
00:14 | '-' Subtraction: e.g. a-b. | |
00:18 | '/' Division: e.g. a/b. | |
00:20 | '*' Multiplication: e.g. a*b. | |
00:24 | '%' Modulus: e.g. a%b. | |
00:27 | To record this tutorial, I am using: Ubuntu 11.10 as the operating system | |
00:32 | gcc and g++ Compiler version 4.6.1 in Ubuntu. | |
00:38 | I will now demonstrate the use of these arithmetic operations with the help of a C program. | |
00:44 | I have already written the program. | |
00:47 | So, I will open the editor and explain the code. | |
00:49 | Here is the C program for arithmetic operators. | |
00:56 | In the first two statements, the variables are declared and defined. | |
01:02 | In the next two statements, | |
01:04 | a is assigned the value of 5. | |
01:06 | b is assigned the value of 2. | |
01:10 | Now let's see how the addition operator works. | |
01:14 | c holds the sum of a and b. | |
01:19 | This printf statement displays the sum of a and b on the screen. | |
01:28 | Here % dot 2f provides the precision of two digits after the decimal point. | |
01:37 | In the next statement, c holds the product of a and b. | |
01:43 | This printf statement displays the product of a and b on the screen. | |
01:48 | Let's see how these two operators work. | |
01:52 | We will comment out the following lines. | |
01:55 | Type /* (slash asterisk) | |
02:01 | */ | |
02:05 | Click on Save. | |
02:07 | Save the file with extension .c (dot c). | |
02:10 | I have saved my file as arithmetic.c. | |
02:15 | Open the terminal window by pressing Ctrl, Alt and T keys simultaneously. | |
02:22 | To compile the code, type the following on the terminal. | |
02:27 | gcc space arithmetic dot c space minus o space arith | |
02:38 | Press Enter. | |
02:40 | To execute the code, type ./arith (dot slash arith). | |
02:48 | press Enter. | |
02:50 | The output is displayed on the screen. | |
02:53 | It shows,Sum of 5 and 2 is 7.00 and | |
02:59 | Product of 5and 2 is 10.00. | |
03:03 | Now you should try the subtraction operator on your own. | |
03:08 | Try replacing the addition operator with subtraction operator. | |
03:13 | You should get the result as 3. | |
03:18 | Coming back to the program and the last set of statements. | |
03:23 | Now, I will explain the code for division. | |
03:26 | Remove the multiline comments here and here. | |
03:34 | In these statements, c holds the value of integer division of a by b. | |
03:40 | Please note that in integer division the fractional part is truncated. | |
03:47 | The printf statement displays the division output on the screen. | |
03:57 | In this statement we are performing real division. | |
04:02 | Here one of the operands has to be cast as float. | |
04:10 | We have type-cast variable a. | |
04:13 | Now a will behave as a float variable for a single operation. | |
04:22 | The printf statement displays the output of real division on the screen. | |
04:30 | Type return 0; and close the ending curly bracket. | |
04:37 | Click on Save. | |
04:40 | Coming back to the terminal to compile and execute the code. | |
04:45 | To compile, typegcc space arithmetic dot c minus o space arith. Press Enter. | |
04:59 | To execute the code, type ./arith. Press Enter. | |
05:05 | The output is displayed on the screen. | |
05:08 | We have the previous outputs of addition and multiplication operators. | |
05:16 | We have the integer Division of 5 by 2 is 2. | |
05:22 | We can see that in integer division the fractional part is truncated. | |
05:29 | Then we have the real division of 5 by 2 is 2.5. | |
05:35 | In real division, the result is as expected. | |
05:37 | We used type-casting to obtain these results. | |
05:45 | Now suppose, I want to write the same program in C++. | |
05:50 | Let's see if I can use the same code in C++ too? | |
05:54 | Let's find out. | |
05:56 | Let me go back to the editor. | |
06:00 | Here is a C++ code. | |
06:05 | Notice that the header is different from the C file header. | |
06:12 | namespace is also used here. | |
06:18 | Also, notice that the output statement in C++ is cout. | |
06:25 | So, apart from these differences, the two codes are very similar. | |
06:32 | Click on Save.Make sure the file is saved with the extension .cpp. | |
06:37 | I have saved my file as arithmetic.cpp. | |
06:41 | Let's execute the code and see what results we get. | |
06:49 | Open the terminal and type g++ space arithmetic dot cpp space minus o arith . Press Enter. | |
07:09 | To execute the code, type ./ arith. Press Enter. | |
07:16 | Here the output is displayed. | |
07:19 | So, we see that the results are similar to the C program. | |
07:23 | The only difference is in the precisions of outputs. | |
07:29 | Let us now summarize the tutorial. | |
07:32 | In this tutorial we learnt how to use the arithmetic operators. | |
07:36 | As an assignment: | |
07:38 | Write a program to demonstrate the use of modulus operator. | |
07:42 | Please note that Modulus operator finds the remainder of division. e.g. c = a % b; | |
07:50 | You should obtain the result as 1. | |
07:55 | Watch the video available at the following link. | |
07:57 | It summarizes the Spoken Tutorial project. | |
08:00 | If you do not have good bandwidth, you can download and watch it. | |
08:05 | The Spoken Tutorial Project Team: Conducts workshops using spoken tutorials. | |
08:09 | Gives certificates to those who pass an online test. | |
08:14 | For more details, please write to contact at spoken hyphen tutorial dot org. | |
08:20 | Spoken Tutorial Project is a part of the Talk to a Teacher project. | |
08:25 | It is supported by the National Mission on Education through ICT, MHRD, Government of India. | |
08:30 | More information on this Mission is available at | |
08:33 | spoken hyphen tutorial dot org slash NMEICT hyphen Intro | |
08:41 | This is Ritwik Joshi from IIT Bombay. Thank you for joining. |