#include <bits/stdc++.h>
using namespace std;
int display(int n)
{
int sum;
if(n == 1)
sum = 1;
else
sum = display(n - 1) * n;
return sum;
}
int main()
{
int n;
cin>>n;
cout<<display(n);
return 0;
}
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Origin blog.csdn.net/KO812605128/article/details/114952996
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