Relational Operators | Operators in C | C language

Relational Operators

The following table shows all the relational operators supported by C. Assume variable A holds 10 and variable B holds 20 then −

Operator	Description	Example
==	Checks if the values of two operands are equal or not. If yes, then the condition becomes true.	(A == B) is not true.
!=	Checks if the values of two operands are equal or not. If the values are not equal, then the condition becomes true.	(A != B) is true.
>	Checks if the value of left operand is greater than the value of right operand. If yes, then the condition becomes true.	(A > B) is not true.
<	Checks if the value of left operand is less than the value of right operand. If yes, then the condition becomes true.	(A < B) is true.
>=	Checks if the value of left operand is greater than or equal to the value of right operand. If yes, then the condition becomes true.	(A >= B) is not true.
<=	Checks if the value of left operand is less than or equal to the value of right operand. If yes, then the condition becomes true.	(A <= B) is true.

 Example

#include <stdio.h>

main() {

   int a = 21;
   int b = 10;
   int c ;

   if( a == b ) {
      printf("Line 1 - a is equal to b\n" );
   }
   else {
      printf("Line 1 - a is not equal to b\n" );
   }
 
   if ( a < b ) {
      printf("Line 2 - a is less than b\n" );
   }
   else {
      printf("Line 2 - a is not less than b\n" );
   }
 
   if ( a > b ) {
      printf("Line 3 - a is greater than b\n" );
   }
   else {
      printf("Line 3 - a is not greater than b\n" );
   }
   
   /* Lets change value of a and b */
   a = 5;
   b = 20;
 
   if ( a <= b ) {
      printf("Line 4 - a is either less than or equal to  b\n" );
   }
 
   if ( b >= a ) {
      printf("Line 5 - b is either greater than  or equal to b\n" );
   }
}

 Output

Line 1 - a is not equal to b
Line 2 - a is not less than b
Line 3 - a is greater than b
Line 4 - a is either less than or equal to  b
Line 5 - b is either greater than  or equal to b

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