Logical Operators

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Logical operators in c language:-

  1.  ! ( logical negation - NOT ) 
  2.  && ( logical AND )
  3.  | | (logical OR)
An expression containing logical operator returns either 0 or 1 depending upon whether expression results true or false.
 1. && ( logical AND ):-
  • If  both operands are true or non zero, condition become true or 1. Otherwise condition become false or 0. 
Suppose A and B are operands,
     If A=2 and B=5, A && B is true or 1.
     If A=2 and B=2, A && B is true or 1.
     If A=2 and B=0, A && B is false or 0.
     If A=2 and B=5, A>0 && B<0 is false or 0.
     If A=2 and B=5, A>0 && B>0 is true or 1.
   
Example:-
#include<stdio.h>
#include<stdlib.h>
int main()
{
    int A = 2;
    int B = 8;

    printf("result is %d. \n",A<0 && B>0);
    printf("result is %d.",A>0 && B>0);

 }

Output:-
result is 0.
result is 1.

2. ! ( logical  negation - NOT )

  • If the logical condition is true or operands are none zero, then logical NOT operator will make it false or Zero.
  • If logical condition is false or operands are zero, then logical NOT operator will make it true or 1.
Example:

#include<stdio.h>
#include<stdlib.h>

int main()
{
    int A = 0;
    int B = 8;

    printf("result is %d\n",!A);
    printf("result is %d",!B);

 }

Output:
  result is 1
  result is 0

3.  | | (logical OR) :

  • If  both operands are false or zero, condition become false or 0. Otherwise condition become true or 1.
Suppose A and B are operands,
     If A=2 and B=5, A || B is true or 1.
     If A=2 and B=0, A ||  B is true or 1.
     If A=0 and B=0, A || B is false or 0.
     If A=2 and B=5, A<0 || B<0 is false or 0.
     If A=2 and B=5, A>0 || B>0 is true or 1.
   
Example:-
#include<stdio.h>
#include<stdlib.h>
int main()
{
    int A = 2;
    int B = 8;

    printf("result is %d. \n",A<0 || B<0);
    printf("result is %d.",A>0 || B>0);

 }

Output:-
result is 0.
result is 1.

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