Intel® Fortran Compiler Classic and Intel® Fortran Compiler Developer Guide and Reference

ID 767251
Date 3/22/2024
Public

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Document Table of Contents

FPUTC

Portability Function: Writes a character to the file specified by a Fortran external unit, bypassing normal Fortran input/output.

Module

USE IFPORT

result = FPUTC (lunit,char)

lunit

(Input) INTEGER(4). Unit number of a file.

char

(Output) Character*(*). Variable whose value is to be written to the file corresponding to lunit.

Results

The result type is INTEGER(4). The result is zero if the write was successful; otherwise, an error code, such as:

EINVAL - The specified unit is invalid (either not already open, or an invalid unit number)

If you use WRITE, READ, or any other Fortran I/O statements with lunit, be sure to read Input and Output Routines in Overview of Portability Routines.

Example

use IFPORT
integer*4 lunit, i4
character*26 string
character*1 char1
lunit = 1
open (lunit,file = 'fputc.dat')
do i = 1,26
  char1 = char(123-i)
  i4 = fputc(1,char1)        !make valid writes
  if (i4.ne.0) iflag = 1
enddo
rewind (1)
read (1,'(a)') string
print *, string

See Also