本文介绍了为什么直接访问I / O在Intel Visual Fortran中工作不正确的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

此计划

  program test

  real a(10)

  open(1, file='f1',access='direct', recl=20)
  do i=1, 10
      a(i) = i-1
  end do
  write(1, rec=1)(a(i),i=1,5)
  write(1, rec=2)(a(i),i=6,10)
  close(1)
  open(1, file='f1',access='direct',recl=8)
  read(1, rec=4)(a(i),i =5,9,4)
  print*,a
  end

视觉Fortran(不正确):

works incorrect in visual Fortran (incorrect):

  0.0000000E+00   1.000000       2.000000       3.000000       9.000000
   5.000000       6.000000       7.000000      0.0000000E+00   9.000000

WATCOM中的结果(正确):

Result in WATCOM (correct):

  0.0000000   1.0000000       2.0000000       3.0000000       6.0000000
  5.0000000   6.0000000       7.0000000       7.0000000       9.0000000

为什么?

推荐答案

Visual Fortran中RECL的默认单位长度是一个字(4bytes)。如果使用选项'Use bytes as RECL = unit for unformatted file'(/ assume:byterecl)编译,你将得到你期望的结果。

The default unit length of RECL in Visual Fortran is a word (4bytes). If you compile with option 'Use bytes as RECL= unit for unformatted file' (/assume:byterecl), you will get what you expect.

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10-16 13:28