重定向与fopen

//重定向

#include<stdio.h>
#define LOCAL
#define INF 1000000000
int main()
{
#ifdef LOCAL
freopen("data.in","r",stdin);
freopen("data.out","w",stdout);
#endif // LOCAL
int x,n=0,min,max,s=0;
while(scanf("%d",&x)==1)
{
s+=x;
if(x<min)min=x;
if(x>max)max=x;
n++;
}
printf("%d %d %.3lf",min,max,(double)s/n);
return 0;
}

//fopen

#include<stdio.h>

#define INF 1000000000
int main()
{
FILE *fin,*fout;
fin=fopen("data.in","rb");
fout=fopen("data.out","wb");
int x,n=0,min,max,s=0;
while(fscanf(fin,"%d",&x)==1)
{
s+=x;
if(x<min)min=x;
if(x>max)max=x;
n++;
}
fprintf(fout,"%d %d %.3lf",min,max,(double)s/n);
fclose(fin);
fclose(fout);
return 0;
}