Example 3.4

FORTRAN Version

!
      PROGRAM P34
!
!
!     Reading and testing LOGICAL variables
!
!
      IMPLICIT NONE
      LOGICAL :: SINGLE
      CHARACTER (LEN=15) :: NAME
      INTEGER :: I,J,MARRGS
!
      PRINT *, 'This is Program >> P34  - Testing with LOGICAL data'
!
!     READ DATA
!
      READ *,I
!
L1:   DO J=1,I
          READ * ,NAME,SINGLE
          IF(NAME  ==  'DONE')EXIT  ! Leave the DO loop
          IF(SINGLE)THEN
             PRINT * ,NAME,'IS SINGLE'
          ELSE
             READ * ,MARRGS
             PRINT * ,NAME,'WAS MARRIED',  &
                      MARRGS,'TIMES'          ! A continued line
          END IF
      END DO L1   ! The EXIT brings control to next statement
      STOP
      END PROGRAM P34

3
'Jane Simpson'       T
'Mary Morrison'      F
3
'DONE'               T

              +--------------------------------------------------+
              |     32-bit Power for Lahey Computer Systems      |
              |   Phar Lap's 386|DOS-Extender(tm) Version 7.0    |
              |  Copyright (C) 1986-94 Phar Lap Software, Inc.   |
              |           Available Memory = 14880 Kb            |
              +--------------------------------------------------+


This is Program >> P34  - Testing with LOGICAL data
Jane Simpson   IS SINGLE
Mary Morrison  WAS MARRIED           3TIMES

Pascal Version

{$G256}
{$P512}
{$D+}
PROGRAM p34 (input, output);
VAR
  single_tmp : 0..1;
  marriages : INTEGER;
  single : BOOLEAN;
  name : STRING[15];
BEGIN
  readln (name, single_tmp );
  WHILE (name <> 'done') DO
    BEGIN
      IF ( single_tmp=1 ) THEN single := TRUE;
      IF ( single_tmp=0 ) THEN single := FALSE;
      IF single THEN
        writeln ( name, 'is single')
      ELSE
        BEGIN
          readln ( marriages );
          writeln ( name, 'was married ' , marriages, ' times')
        END; { end else }
      readln ( name, single_tmp )
    END  { end while }
END.

Jane Simpson       1
Mary Morrison      0
3
done

Last modified: 08/07/97