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

C++.

Arithmetic operators like

+ Addition: eg. a+b.

- Subtraction: eg. a-b.

/ Division: eg. a/b.

* Multiplication: eg. a*b. and

% Modulus: eg. a%b.

Ubuntu 11.10 as the operating system and

gcc and g++ Compiler version 4.6.1 in Ubuntu.

So I will open the editor and explain the code.

int a,b;

float c;

a=5;

b=2;

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

In the next two statements,

a is assigned the value of 5. and b is assigned the value of 2.

c=a+b;

c holds the sum of a and b.

printf("Addition of a and

b is %.2f\n",c);

Here %.2f provides a precision of two digits after the decimal point.

c=a*b;

printf("Multiplication of a and

b is %.2f\n",c);

Let's see how these two operators work.

/*

*/

Type

/*

*/

Save the file with extension .c

I have saved my file as arithmetic.c

gcc space arithmetic.c space -o arith

Type ./arith

gcc space arithmetic.c space -o arith

Press Enter

To execute the code, type

./arith

It shows,

Sum of 5 and 2 is 7.00

and

Product of 5 and 2 is 10.00

Try replacing the addition operator with subtraction operator.

You should get the result as 3.

Delete /* and */

Now, I will explain the code for division.

Remove the multi line comments here and here.

c=a/b;

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

printf("Integer Division of a and b is %.2f\n", c);

c=(float)a/b;

Here one of the operands has to be cast as float.

printf("Real Division of a and b

is %.2f\n",c);

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

printf"

}

gcc arithmetic.c -o arith

Type

./arith

gcc space arithmetic.c space -o space arith Press Enter

To execute the code, type

./arith Press Enter

We have the previous outputs of addition and multiplication operators.

We have the Integer Division of 5 by 2 is 2.00

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

Then we have the Real Division of 5 and 2 is 2.50

In real division the result is as expected.

We used type-casting to obtain these result.

Let see if I can use the same code in C++, too.

Let me go back to the editor.

#include <iostream>

using namespace std;

namespace is also used here.

{

int a,b;

float c;

a=5;

b=2;

c=a+b;

cout <<"Addition of a and b is "

<<c <<"\n";

c=a*b;

cout <<"Multiplication of a and

b is " <<c <<"\n";

c=a/b;

cout <<"Integer Division of a

and b is " <<c <<"\n";

c=(float)a/b;

cout <<"Real Division of a and

b is " <<c <<"\n";

return 0;

}

point to .cpp

Make sure the file is saved with the extension .cpp

I have saved my file as arithmetic.cpp

g++ arithmetic.cpp -o arithmetic

Open the terminal and type

g++ space arithmetic.cpp space -o space arith

Press Enter.

./ arithmetic

./arith Press Enter.

So, we see that the results are identical.

The only difference is in the precisions of outputs.

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

Write a program to demonstrate the use of modulus operator.

Please note that Modulus operator finds the remainder of division.

eg. c = a % b;

You should obtain the result as 1.

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