Operators in C | Increment and Decrement Operator-2

Decrement Operator(–)

The operator –- subtracts 1 (one) from the operand. Decrement operators can be used in two forms.

(i) post decrement (i–)
(ii) Pre decrement (–i)

(i)Post decrement operator (i–)

int i=1,n;
n=i–;	n=i; i=i-1;	n=1; i=0;

In post decrement the value of the variable is used first and then it is decremented.

#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 = 9

(ii)Pre decrement Operator (–i)

int i=1,n;
n=–i;	i=i-1; n=i;	i=0; n=0;

In pre decrement the value of the variable is decremented first and then it is used.

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

/* Output */
a = 9  i = 9

Note: i– or –i when used independently mean the same that is decrement 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=9;