как написать функцию

void Func(int x, double &param1, double &param2, double &param3, double &param4)

{
        if (x==1) 

        {
                param1 = 1 ;
                param2 = 2;
                param3 = param1 +param2;
                и т.д 
        }

        

        if (x==2) 
        {
                param1 = 10 ;
                param2 = 20;
                param3 = param1 +param2;
                и т.д 
        }

   return;
}  

Вообщем как то так.