Relational Operators in C

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Following table shows all the relational operators supported by C language. Assume variable A holds 10 and variable B holds 20 then:

OperatorDescriptionExample
== Checks if the values of two operands are equal or not, if yes then condition becomes true. (A == B) is not true.
!= Checks if the values of two operands are equal or not, if values are not equal then 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 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 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 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 condition becomes true. (A <= B) is true.

Example

Try the following example to understand all the relational operators available in C programming language:

#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" );
   }
}

When you compile and execute the above program it produces the following result:

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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