#include <stdio.h>
int fac(int n);
void main()
{
int n;
scanf("%d",&n);
printf("%d\n",fac(n));
}
int fac(int n)
{
if(n==1||n==0)
{
return 1;
}
else if(n>0)
{
return n*fac(n-1);
}
else
{
return 0;
}
}
Experiment 5.5
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Origin www.cnblogs.com/P201821430028/p/10985010.html
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