funtc51b.dat

这是一个包含多个语言的指令集

fprintf

#include <stdio.h>
int main(void)
{
    FILE *in, *out;
    if ((in = fopen("AUTOEXEC.BAT", "rt"))== NULL)
    {
        fprintf(stderr, "Cannot open input file.
");
        return 1;
    }
    if ((out = fopen("AUTOEXEC.BAK", "wt"))== NULL)
    {
        fprintf(stderr, "Cannot open output file.
");
        return 1;
    }
    while (!feof(in))
        fputc(fgetc(in), out);
    fclose(in);
    fclose(out);
    return 0;
}