Easy to Learn Increment and Decrement Operators in C Language

Increment and Decrement Operators

In C, â€œ++â€ and â€œ--â€œare called increment and decrement operators respectively. Both of these operators are unary operators, i.e., used on single operand. ++ adds 1 to operand and -- subtracts 1 from operand respectively.

Syntax :

increment operator: ++var_name; (or) var_name++;
Decrement operator: --var_name; (or) var_name--;

Example :

Let a=5 then      
a++; // becomes 6
a--; //becomes 5

Program 1 :

#include<stdio.h>
#include<conio.h>
void main( )  {
  int i=1;
  while(i<10) {
   printf(“%d”,i);
  i++;
}
}

Output :

123456789

Program 2 :

#include<stdio.h>
#include<conio.h>
void main( )  {
  int i=20;
  while(i>10)   {
  printf(“%d”,i);
  i--;
  }
}

Output :

20 19 18 17 16 15 14 13 12 11

Pre increment means adding 1 to the value before assigning it to variable ex: ++i;

Post increment means adding 1 to the value after assigning it to variable ex: i++;

Pre decrement means subtracting 1 from the value before assigning it to variable ex: --i;

Post decrement means subtracting 1 from the value after assigning it to variable ex: i--;

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