Difference between revisions of "C-and-C++/C2/Arithmetic-Operators/English-timed"

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| Welcome to the spoken tutorial on '''Arithmetic Operators in C ''''''C++'''.

| Welcome to the spoken tutorial on '''Arithmetic Operators in C ''''''C++'''.

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|-

| In this tutorial, we will learn about  

| In this tutorial, we will learn about  

|-

|-

|Arithmetic operators like

|Arithmetic operators like

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|-

| + Addition: eg. a+b.

| + Addition: eg. a+b.

|-

|-

| - Subtraction: eg. a-b.

| - Subtraction: eg. a-b.

|-

|-

|/ Division: eg. a/b.

|/ Division: eg. a/b.

|-

|-

| *  Multiplication: eg. a*b.

| *  Multiplication: eg. a*b.

  |-

  |-

| % Modulus: eg. a%b.

| % Modulus: eg. a%b.

|-

|-

| 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   

|-

|-

|'''gcc''' and '''g++ Compiler version 4.6.1 in Ubuntu'''.

|'''gcc''' and '''g++ Compiler version 4.6.1 in Ubuntu'''.

|-

|-

| 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.

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|-

|  I have already written the program.

|  I have already written the program.

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|-

|So I will open the editor and explain the code.

|So I will open the editor and explain the code.

|-

|-

|  Here is the C program for arithmetic operators.

|  Here is the C program for arithmetic operators.

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|-

| the first two statements the variables are declared and defined.

| the first two statements the variables are declared and defined.

|-

|-

|In the next two statements,

|In the next two statements,

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|-

|'''a''' is assigned the value of 5.

|'''a''' is assigned the value of 5.

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|-

|'''b''' is assigned the value of 2.

|'''b''' is assigned the value of 2.

|-

|-

|  Now let's see how the addition operator works.

|  Now let's see how the addition operator works.

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|-

|'''c''' holds the sum of '''a''' and '''b'''.

|'''c''' holds the sum of '''a''' and '''b'''.

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|-

|  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.

|-

|-

|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.

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|-

|  In the next statement, '''c''' holds the product of '''a''' and '''b'''.

|  In the next statement, '''c''' holds the product of '''a''' and '''b'''.

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|-

|  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.

|-

|-

|Let's see how these two operators work.

|Let's see how these two operators work.

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|-

|  We will comment out the following lines

|  We will comment out the following lines

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|-

|Type  '''/*'''

|Type  '''/*'''

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|-

| '' */ ''

| '' */ ''

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|-

|  Click on '''Save''  

|  Click on '''Save''  

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|Save the file with extension '''.c'''

|Save the file with extension '''.c'''

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|-

|I have saved my file as''' arithmetic.c'''

|I have saved my file as''' arithmetic.c'''

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|-

|  Open the terminal window by pressing '''Ctrl, Alt and T '''keys''' '''simultaneously.

|  Open the terminal window by pressing '''Ctrl, Alt and T '''keys''' '''simultaneously.

|-

|-

| To compile the code, type the following on the terminal.

| To compile the code, type the following on the terminal.

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|-

|'''gcc space arithmetic dot c space minus o space arith'''

|'''gcc space arithmetic dot c space minus o space arith'''

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|-

|'''Press Enter'''

|'''Press Enter'''

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|-

|To execute the code, type '''./arith'''

|To execute the code, type '''./arith'''

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|-

|  press '''Enter'''

|  press '''Enter'''

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|-

|  The output is displayed on the screen.

|  The output is displayed on the screen.

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|-

|It shows,

|It shows,

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|-

|Sum of 5 and 2 is 7.00 and  

|Sum of 5 and 2 is 7.00 and  

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|-

|Product of 5and 2 is 10.00

|Product of 5and 2 is 10.00

|-

|-

|  Now you should try the subtraction operator on your own  

|  Now you should try the subtraction operator on your own  

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|-

|Try replacing the addition operator with subtraction operator.  

|Try replacing the addition operator with subtraction operator.  

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|-

|You should get the result as 3.

|You should get the result as 3.

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|-

|  Coming back to the program and the last set of statements.

|  Coming back to the program and the last set of statements.

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|-

|Now, I will explain the code for division.

|Now, I will explain the code for division.

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|-

|Remove the multi line comments  here and here.

|Remove the multi line comments  here and here.

|-

|-

|  In these statements, '''c''' holds the value of integer division of '''a''' by '''b'''.

|  In these statements, '''c''' holds the value of integer division of '''a''' by '''b'''.

|-

|-

|Please note that in integer division the fractional part is truncated.

|Please note that in integer division the fractional part is truncated.

|-

|-

| The '''printf '''statement displays the division output on the screen.

| The '''printf '''statement displays the division output on the screen.

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|-

|  In this statement we are performing real division.

|  In this statement we are performing real division.

|-

|-

|Here one of the operands has to be cast as '''float'''

|Here one of the operands has to be cast as '''float'''

|  

|  

|-

|-

| We have type-cast variable a.

| We have type-cast variable a.

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|-

|Now a will behave as a float variable for a single operation.

|Now a will behave as a float variable for a single operation.

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|-

|The printf statement displays the output of real division on the screen.

|The printf statement displays the output of real division on the screen.

|-

|-

| Type '''return 0''' and close the ending curly bracket.

| Type '''return 0''' and close the ending curly bracket.

|-

|-

|  Click on '''Save.'''

|  Click on '''Save.'''

|-

|-

|-

|-

| | 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

|-

|-

|To execute the code, type '''./arith'''Press Enter

|To execute the code, type '''./arith'''Press Enter

|-

|-

| The output is displayed on the screen:

| The output is displayed on the screen:

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|-

|We have the previous outputs of addition and multiplication operators.

|We have the previous outputs of addition and multiplication operators.

|-

|-

|we have the integer Division of 5 by 2 is 2.  

|we have the integer Division of 5 by 2 is 2.  

|-

|-

|We can see  that  in integer division the fractional part is truncated.

|We can see  that  in integer division the fractional part is truncated.

|-

|-

|then we have  the real division of 5 by 2 is 2.5.

|then we have  the real division of 5 by 2 is 2.5.

|-

|-

|In real division the result is as expected.  

|In real division the result is as expected.  

|-

|-

|We  used type-casting to obtain these result.

|We  used type-casting to obtain these result.

|-

|-

|  Now suppose, I want to write the same program in C++.

|  Now suppose, I want to write the same program in C++.

|-

|-

|Let see  if i can use the same code in C++, too?  

|Let see  if i can use the same code in C++, too?  

|-

|-

|  Let's find out.

|  Let's find out.

|-

|-

|Let me go back to the editor.  

|Let me go back to the editor.  

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|-

|  Here is a C++  code.

|  Here is a C++  code.

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|-

|  Notice that the header is different from the C file header.

|  Notice that the header is different from the C file header.

|-

|-

|'''namespace''' is also used here.

|'''namespace''' is also used here.

|-

|-

|  Also, notice that the output statement in C++ is '''cout'''.

|  Also, notice that the output statement in C++ is '''cout'''.

|-

|-

|  So, apart from these differences, the two codes are very similar.

|  So, apart from these differences, the two codes are very similar.

|-

|-

| Click on '''Save'''.

| Click on '''Save'''.

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|-

|Make sure the file is saved with the extension '''.cpp'''

|Make sure the file is saved with the extension '''.cpp'''

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|-

|I have saved my file as''' arithmetic.cpp'''

|I have saved my file as''' arithmetic.cpp'''

|-

|-

| Let's execute the code and see what results we get.

| Let's execute the code and see what results we get.

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|-

|Open the terminal and type  '''g++ space arithmetic dot cpp space  minus o arith'' .'''Press Enter'''

|Open the terminal and type  '''g++ space arithmetic dot cpp space  minus o arith'' .'''Press Enter'''

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|-

| To  execute the  code Type  '''./ arith'''Press Enter'''

| To  execute the  code Type  '''./ arith'''Press Enter'''

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|-

| Here the output is displayed:  

| Here the output is displayed:  

   

   

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|-

|So, we see that  the results are similar to the C program.

|So, we see that  the results are similar to the C program.

|-

|-

|The only difference is in the precisions of outputs.

|The only difference is in the precisions of outputs.

|-

|-

|  Let us now summarize the tutorial.  

|  Let us now summarize the tutorial.  

|-

|-

|In this tutorial we learnt how to use the arithmetic operators.

|In this tutorial we learnt how to use the arithmetic operators.

|-

|-

|  As an assignment:

|  As an assignment:

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|-

|Write a program to demonstrate the use of modulus operator.

|Write a program to demonstrate the use of modulus operator.

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|-

|Please note that Modulus operator finds the remainder of division.  eg. c = a % b;

|Please note that Modulus operator finds the remainder of division.  eg. c = a % b;

|-

|-

|You should obtain the result as 1.

|You should obtain the result as 1.

|-

|-

|  Watch the video available at the following link  

|  Watch the video available at the following link  

|-

|-

|It summarises the Spoken Tutorial project  

|It summarises the Spoken Tutorial project  

|-

|-

|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  

|-

|-

| The Spoken Tutorial Project Team . Conducts workshops using spoken tutorials  

| The Spoken Tutorial Project Team . Conducts workshops using spoken tutorials  

|-

|-

| Gives certificates for those who pass an online test  

| Gives certificates for those who pass an online test  

|-

|-

| 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  

|-

|-

| 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  

|-

|-

| 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

  |-

  |-

| More information on this Mission is available at  

| More information on this Mission is available at  

|-

|-

| spoken hyphen tutorial dot org slash NMEICT hyphen Intro  

| spoken hyphen tutorial dot org slash NMEICT hyphen Intro  

|-

|-

|  This is Ritwik Joshi from IIT Bombay.  

|  This is Ritwik Joshi from IIT Bombay.