// MC_PRG_V6.cpp : main project file.

  
    #include <iostream>  
    #include <iomanip>  
    #include <math.h>  
    #include <stdlib.h>  
    #include<cctype>        // Functions verification

    using std::cin;  
    using std::cout;  
    using std::endl;  
    using std::fixed;
    using std::setprecision;  
    using std::setw;  
    using namespace std;
    
    class Mortgagecal  
    {  
        private:  
            double Intyear;         // interest rate per year  
        public:  
            double LoanAmt;       // amount of the loan  
            double Term;        // term in years  
            double NumMonths;     // term converted to months  
            double IntMonth;      // interest converted to months  
            double PaymentAmt;       // variable for monthly payment  
            double Balance;       // running total  
            double PrincipleAmt; // amount towards loan  
            double AmtMortgage;   // total amount to be paid back  
      
        void Get_Input()  

        {
            while (1)
            //system("cls");
            {
                        // clears the screen
            system("cls");
            cout << "Please enter a loan amount." << endl;  
            cin  >> LoanAmt;  
            cout << endl;
    
            if (cin.fail()) // no extraction took place
            {
            cout << "Please input a valid number" << endl;
            system("pause");
            cin.clear(); // reset the state bits back to goodbit so we can use ignore()
            cin.ignore(1000, '\n'); // clear out the bad input from the stream    
            continue; // try again
            }
            
            cout << "Please enter the loan term in years." << endl;  
            cin  >> Term;  
            cout << endl;

            if (cin.fail()) // no extraction took place
            {
            cout << "Please input a valid number" << endl;
            system("pause");
            cin.clear(); // reset the state bits back to goodbit so we can use ignore()
            cin.ignore(1000, '\n'); // clear out the bad input from the stream
            continue; // try again
            }
            
            cout << "Please enter interest rate." << endl  
                 << "The amount must be in decimal format:" << endl;  
            cin  >> Intyear;  
            cout << endl;
            if (cin.fail()) // no extraction took place
            {
            cout << "Please input a valid number" << endl;
            system("pause");
            cin.clear(); // reset the state bits back to goodbit so we can use ignore()
            cin.ignore(1000, '\n'); // clear out the bad input from the stream
            continue; // try again
            }
            else
            {
                break;
            }    
            
            } // end while
          
    //}
    
        //void Amortization()  
            {  
            NumMonths = Term * 12;    // Converts years to months  
            IntMonth = Intyear/1200;      // Converts annual rate to monthly rate  
            PaymentAmt = (LoanAmt*IntMonth)/  
                    (1-pow(1+IntMonth,-NumMonths));// Amortization formula  
            } // end Amortization()  
      
        //void Print_Output()  
            {  
            cout << endl
                 << "Based on your input..." << endl  
                 << "Your Monthly Mortgage Payment Amount will be: $ "  
                 << fixed << setprecision(2)    // Displays amount to two decimal places  
                 << PaymentAmt << endl;            // Displays the monthly payment
                    system("pause");
            } // end Print_Output()  
            
        } // end get    
        
    }; // end class Mortgagecal
    int main()  
    {  
        Mortgagecal mortCalc;     // an object of the class Mortgagecal  
      
        char chIndicator = 'q'; // to quit or continue  
      
        do{  
            mortCalc.Get_Input();  
            if (!cin)       // if any input from Get_Input() function is    
                return 0;   // invalid it will terminate the program
            cout << endl;         // Next line  
            cout << "Press 'q' to quit or any key to start over: ";  
            cin  >> chIndicator;  // Reads input from user  
            cout << endl;  
      
          }while ((chIndicator !='q') && (chIndicator != 'Q')); // end do loop  
      
        return 0;  
    } // end main()
[code]

Thanks Again,
Ken

[quote name='tyserman474' date='17 Aug, 2008 - 06:38 AM' post='402236']
Nick,
Thank you very much for your help, I will try these and see if I can make them work. I think that I will try the secound one like you suggested.
Thanks,
Ken

[quote name='NickDMax' post='402077' date='16 Aug, 2008 - 07:02 PM']
Well you COULD make a manipulator or even extend an istream and make your own cin, you could even just overload the << operator. But All of these options are not "light weight".


What you CAN do pretty easily is make one or two input functions that add in this functionality:[code=cpp]#include <iostream>
#include <string>
#include <limits>
using namespace std;

int getIntInRange(string prompt, int min, int max);

int main() {
    int val = getIntInRange("Please enter a value between 1 and 10", 1, 10);
    cout << "Value was: " << val << endl;
    getIntInRange("Enter any number", numeric_limits<int>::min(), numeric_limits<int>::max());
    return 0;
}

int getIntInRange(string prompt, int min, int max) {
    int retVal = 0;
    bool isNotGood = true; //true means the input is NOT valid!
    cout << prompt << ": ";
    do {
        cin >> retVal;
        if (!cin.good() || retVal < min || retVal > max) {
            cout << "\n!!! Please enter a number between "
                 << min << " and " << max << " !!!" << endl;
            cin.clear(); //clear the status flag
            //ignore everything in the buffer up to (and including)
            // the first '\n' character.
            cin.ignore(numeric_limits<streamsize>::max(), '\n');
            isNotGood = true;
        } else {
            isNotGood = false; // will cause us to exit the loop!!
        }

    } while (isNotGood);
    return retVal;
}

#include <iostream>
#include <string>
#include <limits>
using namespace std;

template<class T>
int getIntInRange(string prompt, T min, T max);

int main() {
	int val = getIntInRange<int>("Please enter a value between 1 and 10", 1, 10);
	cout << "Value was: " << val << endl;
	getIntInRange<double>("Enter any number", numeric_limits<double>::min(), numeric_limits<double>::max());
	return 0;
}

template<class T>
int getIntInRange(string prompt, T min, T max) {
    int retVal = 0;
    bool isNotGood = true; //true means the input is NOT valid!
    cout << prompt << ": ";
    do {
	    cin >> retVal;
	    if (!cin.good() || retVal < min || retVal > max) {
	        cout << "\n!!! Please enter a number between "
		         << min << " and " << max << " !!!" << endl;
            cin.clear(); //clear the status flag
            //ignore everything in the buffer up to (and including)
            // the first '\n' character.
            cin.ignore(numeric_limits<streamsize>::max(), '\n');
            isNotGood = true;
        } else {
            isNotGood = false; // will cause us to exit the loop!!
        }

    } while (isNotGood);
	return retVal;
}