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