C++primer plus第六版课后编程题答案7.5

7.5

#include <iostream>
using namespace std;
long jiecheng(int);
void main75()
{

cout<<"Please enter the number:";
int n;

while(cin>>n)
{
long result=jiecheng(n);
cout<<"the result of jiecheng "<<n<<"! = "<<result<<endl;
cout<<"Please enter the number :";
}
system("pause");
}
long jiecheng(int n)
{
if(n==0)
return 1;
else
return n=n*jiecheng(n-1);
}