用 fopen fscanf fprintf 读写文件

#include<stdio.h>
#define INF 100000000
int main()
{
    FILE *fin,*fout;
    fin=fopen("data.in","rb");
    fout=fopen("data.out","wb");
    int x,n=0,mn=INF,mx=-INF,s=0;
    while(fscanf(fin,"%d",&x)==1)
    {
        s+=x;
        if(x>mx)
            mx=x;
        if(x<mn)
            mn=x;
        n++;
    }
    fprintf(fout,"max=%d min=%d average=%.3lf\n",mx,mn,s*1.0/n);
    fclose(fin);
    fclose(fout);
    return 0;
}