Hi I am working on a project to get two classes to work with each other but I am getting

'Mortgage::fixedMonthlyPayment': illegal call of non-static member function

PLEASE HELP I am having a lot of trouble getting this thing to work.

my code is below:

Code://MortgageSchedule.cpp #include <iostream> #include <iomanip> using namespace std; #include <fstream> MortgageSchedule::MortgageSchedule(Mortgage m) { Mortgage(); return; } void MortgageSchedule::setFileName(String s) { return; } void MortgageSchedule::displayOnConsole(void) { for(int i=1; i<= Mortgage::mortgageTerm(); i++) { double a = Mortgage::fixedMonthlyPayment(); Mortgage; Total_Amount_Paid += a; Mortgage::makeMonthlyPayment();//not saved in variable Check_Total_Interest_Paid += Mortgage::monthlyInterest(); }//End for cout<< setw(65) << "Full Mortgage Summary Report\n" << setw(60) << "----------------------------------------\n" << setw(10)<<"Total Amount Paid"<<setw(20)<<"Total Interest Paid\n" << setw(9) <<"$"<<Total_Amount_Paid << setw(19) <<"$"<<Mortgage::interestPaidSoFar() << setw(19) <<"check$"<<Check_Total_Interest_Paid; return; } void MortgageSchedule::writeToFile(void) { return; } void MortgageSchedule::setPeriod(char c) { Choice=c; return; }this is the mortgage class---------This is what I am trying to accessCode://MortgageSchedule.h //Filename: MortgageSchedule.h #ifndef MortgageSchedule_H #define MortgageSchedule_H #include "mortgage.h" #include "..\INCLUDE\str.h" class MortgageSchedule { public: void setPeriod(char c); // y yearly display // m monthly display // s summary display // default: summary display void setFileName(String s); // Sets diskfile name for output. void displayOnConsole(void); // Writes the schedule to the console // Period must be set by a previous message, // otherwise the a default schedule is used. void writeToFile(void); // Same as displayToConsole // Except results are written to a // disk file which is set by a previous setFileName message. // In case no previous message is sent. Output goes to "practice.txt". String retrieveDiskFileName(void)const; MortgageSchedule(Mortgage anyMortgage); private: char Choice; double Total_Amount_Paid; double Check_Total_Interest_Paid; /* You do this part*/ }; #endif

Code:// Filename: mortgage.cpp // Abbreviate to work with Tutorial #include "mortgage.h" #include <math.h> const int Mortgage::DEFAULT_TERM = 30; const double Mortgage :: DEFAULT_LOAN = 40000.00; const double Mortgage :: DEFAULT_RATE = 0.10; void Mortgage::makeMonthlyPayment(void) { double interestDue, paymentToPrincipal; interestDue = monthlyInterestRate * remainingLoan; paymentToPrincipal = monthlyPayment-interestDue; remainingLoan = remainingLoan - paymentToPrincipal; monthlyInterestPayment = interestDue; totalInterest += interestDue; return; } double Mortgage::rate(void) const { return 12 * monthlyInterestRate; } double Mortgage::originalLoan(void) const { return initialLoan; } double Mortgage::remainingPrincipal(void) const { return remainingLoan; } double Mortgage::marketValue(void) const { return initialLoan - remainingLoan; } double Mortgage::monthlyInterest(void) const { return monthlyInterestPayment; } double Mortgage::interestPaidSoFar(void) const{ return totalInterest; } double Mortgage::fixedMonthlyPayment(void) const { return monthlyPayment; } int Mortgage::mortgageTerm(void) const { return term; } Mortgage::Mortgage(double principal,double yearlyInterestRate, int lengthOfTermInYears) { term = lengthOfTermInYears; initialLoan = principal; remainingLoan = principal; monthlyInterestRate = yearlyInterestRate/12; monthlyPayment = this->computeMonthlyPayment(); //Interest payments commence with monthly payments. monthlyInterestPayment = 0; totalInterest = 0; return; } Mortgage::Mortgage(void) { term = DEFAULT_TERM; initialLoan = DEFAULT_LOAN; remainingLoan = DEFAULT_LOAN; monthlyInterestRate = DEFAULT_RATE/12; monthlyPayment = this -> computeMonthlyPayment(); //Interest payments commence with monthly payments. monthlyInterestPayment = 0; totalInterest = 0; return; } Mortgage:: ~Mortgage(void) { return; } double Mortgage::computeMonthlyPayment(void) { double temp1,temp2,temp3; double answer; int n = term*12; temp1 = (1+monthlyInterestRate); temp2 = pow(temp1,n); temp3 = monthlyInterestRate/(temp2-1); answer = temp3 * temp2 * initialLoan; return answer; }