#include<iostream>
using namespace std;
/**
3. Write a C++ {\em function} that takes four arguments, H, C, r1 and r2, where
H is the total hours worked, 
r1 is the hourly pay if you worked less than or equal to C hours and
r2 is the hourly pay for each hour above C. The function should
return the net pay. Use this function in a program that asks for 
H, C, r1 and r2 as input and prints out the net pay.
**/

//function prototype
double netpay(double H, double C, double r1, double r2);

int main(){
  double H, C, r1, r2, pay;
  cout<<"Input H, C, r1 and r2 on a single line separated by a space\n";
  cin>>H>>C>>r1>>r2;
  pay=netpay(H,C,r1,r2);
  cout<<"Net pay is "<<pay<<endl;
}

double netpay(double H, double C, double r1, double r2)
{
  if (H <= C)
    return H*r1;
  else return C*r1+(H-C)*r2;
}