VMS Help FORTRAN, Statements, IF, Logical  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Executes the statement if the logical expression is true.
  Statement format:

     IF (e) st

     e   Is a logical expression.

     st  Is a complete Fortran statement. The statement can
         be any statement except DO, END DO, END, block IF,
         or another logical IF statement.