C/C++ | 31-29 求1000！的未尾有几个0（用素数相乘的方法来做，如72=2*2*2*3*3）

#include <iostream>

#define NUM 1000

using namespace std;

int find5(int num) {
int ret = 0;
while (num % 5 == 0) {
num /= 5;
ret++;
}
return ret;
}
int main() {
int result = 0;
int i;
for (i = 5; i <= NUM; i += 5)
{
result += find5(i);
}
cout<<"the total zero number is "<< result<<endl;
system("pause");
return 0;
}