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//
// p. 186
#include <iostream>
using namespace std;
int sum (int n)
{
if (n==1)
return 1;
else
return n + sum(n-1);
}
int factor (int x)
{
if (x==1)
return 1;
else
return x * factor(x-1);
}
int main()
{
int s;
int a;
// To calculate, call the function above like so.
s = sum(3);
a = factor(3);
cout << "Are sum(3) and factor(3) equal to 6?" << "\n";
cout << "The sum with n=3 is: " << s << "\n";
cout << "The factorial 3! equals: " << a << "\n\n";
cout << "..right?" << "\n";
return 0;
}