为什么会有问题啊啊啊

#include<iostream>
#include<cstdio>
using namespace std;
int main(){
    int n,a[105],sum=0;
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>a[i];
        sum+=a[i];
    }
    double ans=(double)(sum)/(double)(n);
    cout<<sum<<" ";
    printf("%.5f",ans);
    return 0;
}