IF Statement

Description

The IF statement controls whether or not a statement is executed based on the value of a logical expression.

Syntax
 

     IF (expr) action-statement
 Where:
 

     

         expr is a scalar LOGICAL expression.
     

         action-statement is an executable statement other than another IF
         

             or the END statement of a program, function, or subroutine.
     

 
 

Remarks

Execution of an IF statement causes evaluation of the logical expression.

If the expression is true, the action-statement is executed.

If the value is false, the action-statement is not executed.

Example
       real :: a=-1
       if (a < 0) write(*,*) " a must be less than zero,&
                  & because this statement was executed"