PakistanHow: Increment & Decrement Operators In C++

Increment & Decrement Operators In C++

The operators that is used to add 1 of the value of a variable is called increment operator.
Similarly, the operator that is used to subtract 1 from the value of the variable is called decrement operator.

The Increment Operator (++):

The increment operator is represented by a double (++) sign. it is used to add 1 to the value of an integer variable. This operator can be used before or after the variable name.

For example, to add 1 to a value of variable xy, it is normally written as

xy=xy+1;

By using increment operator "++" it is written as

xy++;

Prefix Increment Operator:

When an increment operator is used in prefix mode in an expression , it adds 1 to the value of the variable before the value of the variable is used in the expression . For example

# include<iostream.h>

main()

{

int,a,b,c,sum;

a=1;

b=1

c=3;

sum=a+b+(++c);

cout<<"sum="<<sum;

cout<<"c ="<<c;

}

In the above program 1 will be added to the value of c before it is used in an expression. Thus after execution , the sum will be equal to 6 and value of c will be 4.

Postfix Increment Operator:

When an increment operator is used in postfix mode in an expression, it adds 1 to the value of the variable after the value of the variable has been used in the expression.
For example:
sum=a+b+c++;