_putw

Header File

stdio.h

Category

Input/output Routines

Prototype

int _putw(int w, FILE *stream);

Description

Writes an integer on a stream.

_putw outputs the integer w to the given stream. _putw neither expects nor causes special alignment in the file.

Return Value

On success, _putw returns the integer w. On error, _putw returns EOF. Because EOF is a legitimate integer, use ferror to detect errors with _putw.

Example

Copy Code

#include <stdio.h>
#include <stdlib.h>
#define FNAME "test.$$$"
int main(void)
{
   FILE *fp;
   int word;
   /* place the word in a file */
   fp = fopen(FNAME, "wb");
   if (fp == NULL)
   {
      printf("Error opening file %s\n", FNAME);
      exit(1);
   }
   word = 94;
   putw(word,fp);
   if (ferror(fp))
       printf("Error writing to file\n");
   else
       printf("Successful write\n");
   fclose(fp);
   /* reopen the file */
   fp = fopen(FNAME, "rb");
   if (fp == NULL)
   {
      printf("Error opening file %s\n", FNAME);
      exit(1);
   }
   /* extract the word */
   word = getw(fp);
   if (ferror(fp))
       printf("Error reading file\n");
   else
       printf("Successful read: word = %d\n", word);
   /* clean up */
   fclose(fp);
   unlink(FNAME);
   return 0;
}

Portability

POSIX	Win32	ANSI C	ANSI C++
	+

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