View Compilation Error

0_0_31964064_16518.cpp:5:11: error: '::main' must return 'int'
 void main(){  int t, n; double max, arr[100]; scanf("%d", &t); while (t--) {  scanf("%d", &n);  for (int i = 0; i<n; i++)   scanf("%lf", &arr[i]);   max = arr[0];  for (int i = 1; i<n; i++)  if (max<arr[i])   max = arr[i];  printf("%.2lf\n", max); }   system("pause");}
           ^