Logical Operators: 
They are used to combine two or more conditions/constraints or to complement 
the evaluation of the original condition under consideration. They are 
described below: 
 

Logical AND operator: The ‘&&’ operator returns true when both the conditions 
under consideration are satisfied. Otherwise it returns false. For example, a
&& b returns true when both a and b are true (i.e. non-zero).

Logical OR operator: The ‘||’ operator returns true even if one (or both) of
the conditions under consideration is satisfied. Otherwise it returns false. 
For example, a || b returns true if one of a or b or both are true 
(i.e. non-zero). Of course, it returns true when both a and b are true.

Logical NOT operator: The ‘!’ operator returns true the condition in 
consideration is not satisfied. Otherwise it returns false. For example, 
!a returns true if a is false, i.e. when a=0.

#include<stdio.h>
int main(){
  A = 5;
  B = 10;
if((A == 5) && (B < 11)){
 printf(“Both conditions are ture”);
}

if(!(A==5)){
 printf(“A is not equal to 5”);
}

if((A>=3) ||(B<=9)){
 printf(“min any one condition is true”);
}

}

// Working of relational operators
#include <stdio.h>
int main()
{
    int a = 5, b = 5, c = 10;

    printf("%d == %d is %d \n", a, b, a == b);
    printf("%d == %d is %d \n", a, c, a == c);
    printf("%d > %d is %d \n", a, b, a > b);
    printf("%d > %d is %d \n", a, c, a > c);
    printf("%d < %d is %d \n", a, b, a < b);
    printf("%d < %d is %d \n", a, c, a < c);
    printf("%d != %d is %d \n", a, b, a != b);
    printf("%d != %d is %d \n", a, c, a != c);
    printf("%d >= %d is %d \n", a, b, a >= b);
    printf("%d >= %d is %d \n", a, c, a >= c);
    printf("%d <= %d is %d \n", a, b, a <= b);
    printf("%d <= %d is %d \n", a, c, a <= c);
  
//Output

//5 == 5 is 1
//5 == 10 is 0
//5 > 5 is 0
//5 > 10 is 0
//5 < 5 is 0
//5 < 10 is 1
//5 != 5 is 0
//5 != 10 is 1
//5 >= 5 is 1
//5 >= 10 is 0
//5 <= 5 is 1
//5 <= 10 is 1 
    return 0;
}