基本文件输入输出

#include "stdafx.h"
#include <stdio.h>

int main() {
FILE *fin,*fout;
fin = fopen("data.in", "rb");
fout = fopen("data.out", "wb");
int x, n = 0, min, max, s = 0;
fscanf(fin, "%d", &x);
min = max = x;
s += x; n++;
while (fscanf(fin, "%d", &x) == 1) {
if (x < min)
min = x;
if (x > max)
max = x;
n++;
}
fprintf(fout, "%d %d %.3f\n", min, max, (double)s / n);
fclose(fin);
fclose(fout);
return 0;

}

声明两个变量fin和fout，使输入流源和输出流目标定向为文件，其余用法和scanf，printf类似