Recursion Chapter 17 > Q.7

Q7:

#include <iostream>

using namespace std;

int mystery(int number);

int main()

{

while (1)

{

int x;

cout << "x: ";

cin >> x;

cout << mystery(x) << endl << endl;

}

}

int mystery(int number)

{

if (number == 0)

return number;

else

return (number + mystery(number-1));

}

Output: