Relational

 Relational expressions consist of two or more expressions whose
 values are compared to determine whether the relationship stated by
 the relational operator is satisfied.  The expression is reduced to
 a logical value (true or false).

 The following are relational operators:

       Operator         Meaning
       ------------------------------------------
        .LT. or <       Less than
        .LE. or <=      Less than or equal to
        .EQ. or ==      Equal to
        .NE. or /=      Not equal to
        .GT. or >       Greater than
        .GE. or >=      Greater than or equal to

 NOTE: Expressions of COMPLEX data type can use only 
       .EQ.  and .NE. operators.