1.5编程基础之循环控制_ 01:求平均年龄

#include<cstdio>
int main(){
 int n,x,sum=0;
 scanf("%d",&n);
 for (int i=1;i<=n;i++){
  scanf("%d",&x);
  sum=sum+x;
 }
 printf("%.2lf",(double)sum/n);
 return 0;
}

http://noi.openjudge.cn/ch0105/01/