Logical Operators in C

Logical Operators

Operator
Notation

OR
||

AND
&&

NOT
!

The operators follow the same precedence in compound conditions as in other languages-NOT (!) is evaluated before AND (&&) which is evaluated before OR (||).

Brackets() are used to change this order.

The following example demonstrates the use of these logical operators:

#include <stdio.h>

/* function to demonstrate the use of the logical operators */

main()

{

char niv;

  puts ("Enter 'Y' for Yes or 'N' for No");

niv=getchar();

if (niv != 'Y' && niv != 'y' && niv != 'N' && niv != 'n')

   puts("Invalid Input");

  else if (niv = = 'Y' || niv = = 'y')

   puts ("Input was Y or y");

else if (niv = = 'N' || niv = = 'n')

   puts ("Input was N or n");

}