题解 | #Factorial#
Factorial
https://ac.nowcoder.com/acm/problem/14323
题目描述
Hill was a clever boy,he like math very much.Today teacher give him a question.
calculate N! . But Hill was tired,he need to sleep,so let you help him to calculate N!.
what is N!
N! = 1*2*3*......*N
Hey, you need to think about 0! . Do you?
calculate N! . But Hill was tired,he need to sleep,so let you help him to calculate N!.
what is N!
N! = 1*2*3*......*N
Hey, you need to think about 0! . Do you?
输入描述:
There are multiple test cases. The first line is an positive integer T indicating the number of test cases.(0<T<=1000)
For each test case:
A positive integer N(0<=N<=20)
For each test case:
A positive integer N(0<=N<=20)
输出描述:
For each test case, output one line.
用递归方法计算阶乘，remember：阶乘类型要用long long，不然会溢出
#include<iostream>
using namespace std;
long long Calculate(int n)
{
if(!n) return 1;
else return n*Calculate(n-1);
}
int main()
{
int n;
cin>>n;
int sum;
while(n--)
{
cin>>sum;
cout<<Calculate(sum)<<endl;
}
return 0;
} 
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