xt4-11.cpp

最新版谭浩强《c++语言程序设计》所有习题的原代码

#include <iostream>
using namespace std;
int main()
{int f(int);
 int n,s;
 cout<<"input the number n:";
 cin>>n;
 s=f(n);
 cout<<"The result is "<<s<<endl;
 return 0;
} 

int f(int n)
 {;
  if (n==1)
     return 1;
  else
     return (n*n+f(n-1));
}