Relational operators are used to compare two values or expressions to evaluate the relationship. Following table lists the relational operators in C++.

  #include <iostream.h>
  using namespace std;
  int main( )
    {
      int a = 20;
      int b = 10;
      if ( a < b )
       { 
        cout << " a is less than b" ;
       }
      else
       {
        cout << "b is less than a";
       }
     }       

   b is less than a

In the above example the relational operator "<" is used to check if a is less than b. Thus comparison between two values or expression can be performed using this operator.