C++ hdu 2071 Max Num

#include<iostream>#include<iomanip>using namespace std;int main(){    int t, n, i;    double max, a[101];    cin >> t;    while (t--)    {        cin >> n;        for (i = 0; i<n; i++)        {            cin >> a[i];        }        max = a[0];        for (i = 1; i<n; i++)        {            if (a[i]>max)            {                max = a[i];            }        }        cout <<fixed<<setprecision(2)<< max << endl;    }    return 0;}