Relational operator

Relational operators are binary operators(operates on two operands) and are used to relate or compare two operands. There are four relational operators in C (i.e <, <=, >, >=). If the relationship between the operands is correct, it will return 1 and returns 0 otherwise.

Apart from four relational operators, C has two equality operator (== and !=) as well for comparing operands. Now let's take a look at different relational and equality operators and how they operate on the operands.

Operator	Name	Description	Example
<	'Less than' operator	Checks if the first operand is less than second operand and returns 1 if it's true, else returns 0	10 < 5 returns 0 and5 < 10 returns 1
<=	'Less than or equals to' operator	Checks if the first operand is less than or equals to second operand and returns 1 if it's true, else returns 0	10 <= 10 returns 1 and 10 <= 5 returns 0
>	'Greater than' operator	Checks if the first operand is greater than second operand and returns 1 if it's true, else returns 0	10 > 5 returns 1 and5 > 10 returns 0
>=	'Greater than or equals to' operator	Checks if the first operand is greater than or equals to second operand and returns 1 if it's true, else returns 0	10 >= 10 returns 1 and 5 >= 10 returns 0
==	Equality operator	Checks if the two operands are equal are returns 1 if it's true, else returns 0	10 == 10 returns 1 and 10 == 1 returns 0
!=	Non-equality operator	Checks if the two operands are equal are returns 1 if they are not equal, else returns 0	10 != 10 returns 0 and 10 != 1 returns 1

Examples of Relational Operator

#include <stdio.h>
 
int main()
{
  int a = 25, b = 10;
  printf("%d < %d : %d\n", a, b, a < b);
  printf("%d <= %d: %d\n", a, b, a <= b);
  printf("%d > %d : %d\n", a, b, a > b);
  printf("%d >= %d: %d\n", a, b, a >= b);
  printf("%d == %d: %d\n", a, b, a == b);
  printf("%d != %d: %d\n", a, b, a != b);
  
  return 0;
}
 
Output:
  25 < 10 : 0
  25 <= 10: 0
  25 > 10 : 1
  25 >= 10: 1
  25 == 10: 0
  25 != 10: 1