Operators in C | Increment and Decrement Operator

Increment and Decrement Operator

These operators are used to either increase or decrease the value of the variable by one.
The increment operator (++) and decrement operator (–) are both unary operators.

Increment Operator (++)

The operator ++ adds 1 (one) to the operand. Increment operator can be used in two forms.

(i). post increment (i++)
(ii). Pre increment (++i)

(i) Post increment operator (i++)

int i=1,n;
n=i++;	n=i; i=i+1;	n=1; i=2;

In post increment the value of the variable is used first and then it is incremented.

#include<stdio.h>
int  main()
{
	int a,i=10;
	a=i++;
	printf("a = %d  i = %d\n",a,i);
    return(0);
}

/* Output */
a = 10  i = 11

(ii)Pre increment Operator (++i)

int i=1,n;
n=++i;	i=i+1; n=i;	i=2; n=2;

In pre increment the value of the variable is incremented first and then it is used.

Note: i++ or ++i when used independently mean the same that is increment the value by one.

if we have a=10;

a++;
++a;
a=a+1;
a+=1;

On execution of any of the above statements we will get
a=11;

#include<stdio.h>
int  main()
{
	int a,i=10;
	a=++i;
	printf("a = %d  i = %d\n",a,i);
    return(0);
}

/* Output */
a = 11  i = 11