Question

Srie un program utilizînd un subprogram recursiv: Calculeaza suma S(n)=3+6+9...+3n

Answer 1

#include <iostream>

using namespace std;

int suma (int n, int i)

{

if (i<=n)

return 3*i+suma(n, i+1);

else

return 0;

}

int main ()

{

int n;

cin>>n;

cout<<suma(n,1);

}