非ANSI标准函数

函数名: putw

功 能: 把一字符或字送到流中

用 法: int putw(int w, FILE *stream);

返回值：返回输出的整数，如果出错，则返回EOF

程序例:

#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\", FNAME);

exit(1);

}

word = 94;

putw(word,fp);

if (ferror(fp))

printf("Error writing to file\");

else

printf("Successful write\");

fclose(fp);

/* reopen the file */

fp = fopen(FNAME, "rb");

if (fp == NULL)

{

printf("Error opening file %s\", FNAME);

exit(1);

}

/* extract the word */

word = getw(fp);

if (ferror(fp))

printf("Error reading file\");

else

printf("Successful read: word = %d\", word);

/* clean up */

fclose(fp);

unlink(FNAME);

return 0;

}