c++新手都不算的问题

Question

c++能直接阶乘吗？还是只能用for语句？

Answer 1

可以递归#include<iostream>&nbsp;&nbsp;&nbsp;using namespace std;&nbsp;int fac(int);&nbsp;int main(){&nbsp; &nbsp; int n;&nbsp;&nbsp; &nbsp; while (cin >> n)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; cout << n << "!= " << fac(n) << endl;&nbsp; &nbsp; }&nbsp;&nbsp; &nbsp; return 0;}&nbsp;int fac(int x)&nbsp; &nbsp;//递归函数&nbsp;&nbsp;{&nbsp; &nbsp; int f;&nbsp;&nbsp; &nbsp; if (x == 0 || x == 1)&nbsp; &nbsp; &nbsp; &nbsp; f = 1;&nbsp; &nbsp; else&nbsp; &nbsp; &nbsp; &nbsp; f = fac(x - 1)*x;&nbsp;&nbsp; &nbsp; return f;}

Answer 2

没有相关函数，只能自己乘