题解 | #n的阶乘#
n的阶乘
https://www.nowcoder.com/practice/97be22ee50b14cccad2787998ca628c8
#include <stdio.h>
typedef long long ll;
ll fun(ll a) {
if(a==0||a==1) {
return 1;
} else {
return a*fun(a-1);
}
}
int main() {
ll a;
scanf("%d",&a);
printf("%lld",fun(a));
return 0;
}
