C Logical Operators

In this lesson, you will learn about Logical Operators in C, their usage, and examples to better understand the topic.

What are Logical Operators?

Logical operators in C are used to combine conditional statements. For example, if you have two variables, a and b, and want to check if both are different than null, we use the conditional operator &

 if ( a == 0 && b == 0)

The table below illustrates the Logical Operator in C

Example of Logical Operators in C

#include <stdio.h>

int a, b, c;
int main() {
  a = 24;
  b = 12;
  printf("a = 24");
  printf("\n");
  printf("b = 12");
  printf("\n");
  //&& 
  if (a && b) {
    printf("%d && %d Both operands are true ", a, b);
  } else {
    printf("%d && %d Either operands is true ", a, b);
  }
  printf("\n");
  //||  
  if (a || b) {
    printf("%d || %d Either operands is true ", a, b);
  } else {
    printf("%d || %d Both operands are false ", a, b);
  }
  printf("\n");
  if (a) {
    printf("%d operand is true ", a);
  } else {
    printf("%d operand is not true ", a);
  }
  printf("\n");
  if (!a) {
    printf("%d operand is true ", a);
  } else {
    printf("%d operand is not true ", a);
  }
  return 0;
}

Output

a = 24
b = 12
24 && 12 Both operands are true 
24 || 12 Either operands is true 
24 operand is true 
24 operand is not true

In the next lesson, you will learn about the Assignments Operators in C.