#include <iostream>
using namespace std;

int proc1(int a=3, int b=6, char c='b');

int main (void)
{
	cout << proc1(10,20) << endl;
	cout << proc1(5) << endl;
	cout << proc1(1,1,'c') << endl;
	cout << proc1(2,2,'d') << endl;
}

int proc1(int a, int b, char c)
{
	int d(0);
	switch (c) {
          case 'a': d=1;
                    break;
	  case 'b': d=2;
                    break;
	  case 'c':
          case 'd': d=3;
		    break;
	  default:  d=4;
	}
        return((a+b)*d);
}