//lending.cpp
#include<iostream>
using namespace std;

//function prototypes
bool borrow(float limit, float & current_debt);
  //limit and current_debt are PARAMETERS
  
void introduction(float line_of_credit);
  //no return value, one parameter

int main()
      {  
      float debt_limit=1000.00;
      introduction(debt_limit);  //FUNCTION CALL
            //debt_limit is the ARGUMENT
      float debt=0;
      cout << "Would you like to borrow? (y or n)" << endl;
      char choice;
      cin >> choice;
      while (choice == 'y')
            {
            bool success;
            success = borrow(debt_limit, debt);  //function CALL
               //debt_limit and debt are the ARGUMENTS.
               //success is assigned the RETURN VALUE.
            if (success)
                cout << "Another loan? (y or n)";
            else
                cout << "Try another amount? (y or n)";
            cin >> choice;
             } //end while
      cout << "Come again!";
      return 0;
      } //end main

//function implementation (definition)
bool borrow(float limit, float & current_debt)  
      {
      float loan;  //local to this function
      cout << "How much would you like to borrow? $";
      cin >> loan;
      if (loan + current_debt <= limit)
            {
            current_debt += loan; 
                //current_debt=current_debt+loan
            cout << "Here is your loan of $" << loan << endl;
            return true;
            } //end then clause
      else //exceeds limit
            {
            cout << "I cannot make that loan.\n " 
               << "Your current debt is too near your debt limit."
               << endl;
            return false;
            }
      } //end borrow
      
void introduction(float line_of_credit)
    {
    cout << "Welcome to the House of Money." << endl;
    cout <<"Your line of credit is: $" << line_of_credit<<endl;
    return;
    }