freopen

函数名: freopen

功 能: 替换一个流

用 法: FILE *freopen(char *filename, char *type, FILE *stream);

位置：stdio.h

程序例:

#include <stdio.h>

int main(void)

{

/* redirect standard output to a file */

if (freopen("OUTPUT.FIL", "w", stdout)

== NULL)

fprintf(stderr, "error redirecting

stdout

");

/* this output will go to a file */

printf("This will go into a file.");

/* close the standard output stream */

fclose(stdout);

return 0;

}