[Sara161616]

Hi, this is my first post here. I'm majorly stuck on this program where I have to write a mortgage program using classes, and print out an ammortization table. This is what I have so far, and it compiles, but it won't print output. Please let me know if you have any suggestions. Thanks!

#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
float GBegBal, GRate, GPayment;
int GPeriods;

//Prototypes
void DisplaySchedule(float BegBal,float Rate,int Periods,float Payment);
float CalcPayment(float BegBal,float Rate,int Periods); 
float DoPVCalc(float FutVal,float Rate,int Period, float Payment);



class Mortgage  //declaring class Mortgage
{
      public:
             Mortgage(float BegBal, float Rate, int Periods);  //constructor
             ~Mortgage();         // destructor
              float GetBegBal(); // accessors get and set
              void SetBegBal(float BegBal);
              float GetRate();
              void SetRate(float Rate);
              int GetPeriods(); 
              void SetPeriods (int Periods); 
              float GetPayment();
      private:
              float MBegBal, MRate, MPayment;
              int MPeriods;
      };
      
      // constructor of Mortgage
      Mortgage::Mortgage(float BegBal, float Rate, int Periods)
      {
              MPeriods = Periods;
              MRate= Rate;
              MBegBal = BegBal;
              MPayment = CalcPayment(BegBal,Rate,Periods);
      }

      Mortgage::~Mortgage()       //destructor
      {
      }
      
      float Mortgage::GetBegBal()
      {
          return MBegBal;
      }

      void Mortgage::SetBegBal(float BegBal)
      {
           MBegBal = BegBal;
           MPayment=CalcPayment(MBegBal,MRate,MPeriods);
      }   

      float Mortgage::GetRate()
      {
          return MRate;
      }

      void Mortgage::SetRate(float Rate)
      {
           MRate = Rate;
           MPayment=CalcPayment(MBegBal,MRate,MPeriods);
      }  

      int Mortgage::GetPeriods()
      {
          return MPeriods;   
      }

      void Mortgage::SetPeriods(int Periods)
      {
           MPeriods = Periods;
           MPayment=CalcPayment(MBegBal,MRate,MPeriods);
      }     

      // Get Payment
      float Mortgage::GetPayment()
      {
      return MPayment;
      }

      // Calculate payment amount
      float CalcPayment(float BegBal,float Rate,int Periods)
      {
      float Payment=0;
      Payment=0-(BegBal*pow((1+Rate),Periods));
      Payment=Payment/((pow((1+Rate),Periods)-1)/Rate);
      return Payment;
      }

      void DisplaySchedule(float BegBal,float Rate,int Periods,float Payment)
{
     
      float Interest,Principle,EndBal;
      int BegPer=0,EndPer,CalcPer;
      while (true)
      {
      cout << "Beginning Period : ";
      cin >> BegPer;
      if(BegPer > 0)
      break;
      cout << "Invalid Period.\n";
      }
      cout << "Ending Period : ";
      cin >> EndPer;
      CalcPer=Periods - (BegPer-1);
      BegBal=DoPVCalc(0,Rate,CalcPer,Payment);

      cout << "Period------BegBal------Payment-----Interest----Principle---EndBal------\n";
      for (int Per=BegPer;Per<=EndPer;Per++)
{
      Interest=BegBal*Rate;
      Principle=Payment-Interest;
      EndBal=BegBal-Principle;
      cout << setw (10) << left << Per;
      cout << setw (12) << right << setprecision(8) << BegBal;
      cout << setw (12) << right << Payment;
      cout << setw (12) << right << Interest;
      cout << setw (12) << right << Principle;
      cout << setw (12) << EndBal << "\n";
      BegBal=EndBal;
     
 }
 }
     float DoPVCalc(float FutVal,float Rate,int Period,float Payment)
     {
     float PresVal=0;
     for (int i=1;i<Period+1;i++)
     {
     PresVal=PresVal+Payment/pow((1+Rate),i);
     }
     PresVal=PresVal+FutVal/pow((1+Rate),Period);
     return PresVal;
}
      int main()
     {
GBegBal=-100000;
GRate=.01;
GPeriods=360;
Mortgage MyMort(GBegBal,GRate,GPeriods);
MyMort.SetBegBal(GBegBal);
MyMort.SetRate(GRate);
MyMort.SetPeriods(GPeriods);
float BegBal=MyMort.GetBegBal();
float Rate=MyMort.GetRate();
int Periods=MyMort.GetPeriods();
float Payment=MyMort.GetPayment();
void DisplaySchedule(float BegBal,float Rate,int Periods,float Payment); 
return 0;
   }             

[Israel]

Ok, I'm new here, and probably wrong. But don't you need an
"int main" in there somewhere?

[Amadeus]

Actually, there is a main function (albeit difficult to spot).

The reason it has not dislayed the information is because of a slight syntax error in calling the display function. Change

void DisplaySchedule(float BegBal,float Rate,int Periods,float Payment); 

to

DisplaySchedule(BegBal,Rate,Periods,Payment);

It should then prompt the user for the start and end periods, and display the results.

[Sara161616]

Thanks so much. It runs perfectly now. I had to change the computation of rate also, but that was easy.

This post has been edited by Sara161616: 25 October 2005 - 02:04 PM