9.1.5 Logical Operators

• Logical operators are used with decision making statements. 
• These operators are used to control two statements together in control statements.
• For example, you can check 2 conditions instead of one in an if statement. 
• T he following about logical operators is being given.

Operators	Description
&& (AND)	When both conditions are true then the control statement value becomes true.
|| (OR)	When any one condition is true, the control statement value becomes true.
! (NOT)	These operators are used with the same condition. When that condition is false then the control statement's value becomes true.

EXAMPLE :-

// Logical operators in C.

#include <stdio.h>

int main()

{

int x = 10, y = 5, z = 10, res;

res = (x == y) && (z > y);

printf("(x == y) && (z > y) is %d \n", res);

res = (x == y) && (z < y);

printf("(x == y) && (z < y) is %d \n", res);

res = (x == y) || (z < y);

printf("(x == y) || (z < y) is %d \n", res);

res = (x != y) || (z < y);

printf("(x != y) || (z < y) is %d \n", res);

res = !(x != y);

printf("!(x == y) is %d \n", res);

res = !(x == y);

printf("!(x == y) is %d \n", res);

return 0;

}

OUTPUT

(x == y) && (z > y) is 0 (x == y) && (z < y) is 0 (x == y) || (z < y) is 0 (x != y) || (z < y) is 1 !(x == y) is 0 !(x == y) is 1