题目:
2.使用array对象(而不是数组)和long double(而不是long long)重新编写程序清单5.4,并计算100!的值。
程序清单5.4如下:
#include <iostream>
const int ArSize = 16;
int main()
{
long long factorials[ArSize];
factorials[1] = factorials[0] = 1LL;
for (int i=2;i<ArSize;i++)
factorials[i] = i * factorials[i-1];
for(int i=0;i<ArSize;i++)
std::cout<<i<<"! = " <<factorials[i]<<std::endl;
return 0;
}
答案: 书上无答案。
C++技术网辅导详解解答:
参考源码:
#include <iostream>
#include <array>
using namespace std;
const int ArSize = 100;
int main()
{
array<long double, ArSize> factorials;
factorials[1] = factorials[0] = 1LL;
for (int i = 2; i < ArSize; i++)
factorials[i] = i * factorials[i - 1];
for (int i = 0; i < ArSize; i++)
std::cout << i << "! = " << factorials[i] << std::endl;
return 0;
}
此题主要是array的运用。