CODEWITHSUNDEEP
cgcc
Venkatesan S. Venkatesan
Venkatesan S. Venkatesan

Reputation: 23

putw() function in C

Following program with putw is not writing the required data in the file.

#include <stdio.h>
int main(void)
{
   FILE *fp;
   fp = fopen("a.txt", "w");
   putw(25,fp);
   putw(325,fp);
   putw(425,fp);
   fclose(fp);
   return 0;
}

Program is compiled and executed like the following

gcc filename.c
./a.out

It is writing something in the file. Also if we read the integer using getw(), it is reading the value which is not available in the file. Even it is not the ASCII value.

When it is compiled with gcc filename.c -std=c99, it is showing implicit declaration warning error.

Is it required to link any library files to use putw/getw in c.

Upvotes: 0

Views: 2030

Answers (2)

D.Shawley
D.Shawley

Reputation: 59623

putw is an ancient function that exists on some platforms. Use fwrite and fread instead. You should also check the return value from putw. It may be telling you why it is failing.

Upvotes: 1

Lundin
Lundin

Reputation: 214780

There is no function called putw in standard C, which is why you get compiler warnings. You probably meant to use putwc in wchar.h.

Upvotes: 1

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