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

C++.

Arithmetic operators

+ Addition: eg. a+b.

- Subtraction: eg. a-b.

/ Division: eg. a/b.

* Multiplication: eg. a*b.

% 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.

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 the 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 the file as arithmetic.c

gcc incr.c -o incr

Type

./incr

gcc arithmetic.c -o arith

Press Enter

To execute the code, type

./arith

It shows,

Sum of a and b is 7.00

and

Product of a and b 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 from 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"

For real division, one of the operands has to be cast as float.

}

gcc incr.c -o incr

Type

./incr

gcc arithmetic.c -o arith

To execute the code, type

./arith

We have the previous outputs of addition and multiplication operators.

We have Integer Division of 5 and 2 is 2.00

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

Then we have 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 can we 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++ arithmetic.cpp -o arith

Press Enter.

./ arithmetic

./ arith

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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