5.2

#define  _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<array>
using namespace std;
int main()
{
const int ArSize = 101;//注意array对象的边界
array<long double,ArSize>factorials;
factorials[0] = factorials[1] = 1;
cout << "0!= " << factorials[0] << endl;
cout << "1!= " << factorials[1] << endl;
for (int i = 2; i < ArSize; i++)
{
factorials[i] =i* factorials[i - 1];
cout << i << "!= " << factorials[i]<<endl;
}
return 0;
}