PC^2/pc2judge/samps/sumit.f

   1 *
   2 * vi:ts=6:sw=6:ai:ic
   3 *
   4 * File: sum.f
   5 * Purpose: to sum the numbers from num.dat
   6 * Source: Fortran 77 (compiled under Linux/fort77)
   7 * Author: pc2@ecs.csus.edu (laned)
   8 * Source: FORTRAN 77
   9 * OS: Tested under Linux
  10 * $Id: sumit.f,v 1.1 2005/03/06 05:13:57 laned Exp $
  11 *
  12 *23456789
  13 * On Open the STATUS can be:
  14 *
  15 * 'OLD' - file exists
  16 * 'NEW" - create the file
  17 * 'SCRATCH' - this file is only used as long as the program runs
  18 * 'UNKNOWN' - none of the above, depends on OS
  19 *
  20 * IOSTAT returns an INTEGER
  21 * .eq. 0  - OK
  22 * .lt. 0 - error during I/O
  23 * .gt. 0 - EOF
  24 *
  25
  26 *23456789
  27
  28         INTEGER IOS
  29         INTEGER IVALUE
  30         INTEGER THESUM
  31         CHARACTER INFILE * 20
  32
  33         INFILE = 'sumit.dat'
  34
  35         THESUM = 0
  36
  37       OPEN (UNIT = 5, FILE=INFILE, STATUS='OLD', IOSTAT=IOS)
  38
  39         IF (IOS .NE. 0) GOTO 200
  40
  41  100  CONTINUE
  42
  43         READ (5, 500, IOSTAT = IOS) IVALUE
  44 *       READ (5, '(I)', IOSTAT = IOS) IVALUE
  45
  46         IF (IVALUE .GT. 0) THEN
  47                 THESUM = THESUM + IVALUE
  48         END IF
  49
  50         IF (IOS .NE. 0) GOTO 200
  51         IF (IVALUE .EQ. 0) GOTO 200
  52
  53         GOTO 100
  54
  55  200  CONTINUE
  56
  57         IF (IOS .EQ. 2) THEN
  58           PRINT *, 'FILE NOT FOUND ',INFILE
  59           STOP
  60         ELSE IF (IOS .GT. 0) THEN
  61           PRINT *, 'ERROR NUMBER', IOS, ' ON FILE ',INFILE
  62           STOP
  63         END IF
  64
  65         PRINT *, 'THE SUM IS ',THESUM
  66
  67       CLOSE (UNIT = 5)
  68
  69  500  FORMAT (I12)
  70
  71 *23456789
  72       END