1.5-01:求平均年龄

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