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Increment and Decrement Operators in C

Last Updated on Wednesday 5th Oct 2022
  • Increment operator ++ is used to add 1 to a variable.
  • Decrement operator -- is used to subtract 1 from a variable.
  • Increment & Decrement operators in their so-called prefix or postfix forms.

Prefix operators.

The prefix operator increments/decrements the value of a variable before the variable is used in an expression.

++var_name – prefix ++ operator --var_name – prefix -- operator

Postfix operators.

When used as a postfix operator, the program evaluates a variable in an expression and then increments its value.

  • var_name++ – postfix ++ operator
  • var_name-- – postfix -- operator
			
					#include <stdio.h>
int main(void) {
  int x = 10;
  int y = 10;
  int myprefix = ++x;
  int mypostfix = y++;
  printf("Prefix: %d, Postfix: %d\n", myprefix, mypostfix);
}

			
	
  • We have two int variables, x, and y, both having a value of 10.
  • We use the prefix ++ operator on x.
  • The x is incremented by one before the result of an expression is assigned to my prefix variable.
  • Then, we use a postfix operator on y.
  • The result of an expression is assigned to my postfix var, and then the value is incremented by one.