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Loops to Allow users to go back and enter new data or just quit

P: 10
I am working on an assignment where I have to allow end-users to enter in data and to have C++ make a calculation. From there I have to set up a loop to allow users to go back and enter new data or just quit. I have the part down where the users are entering in information to get a calculation, but I am not understanding the part about looping to go back, any direction will be greatly appreciated. Here is my code for now:
//************************************************** *****
//Program: Calculations Payments
//Purpose: To calculate a mortgage monthly payment by the user entering input
// and to allow the user to enter new data if they wish or to just quit the program.
//Programmer: Cameron Faldeti
//Date: 10/30/06
//School: University of Phoenix
//Class: POS 440: Introduction To C++
//Instructor: John Williams
#include <iostream>
#include <iomanip>
#include <cmath> //Header file in order for a user to calculate math formulas
using namespace std;
int main()
{

//Variable declarations
double LoanAmount; //Loan amount entered by the user in order to calculate a mortgage monthly payment
int term; //Years entered by user to use for calcuating the monthly payment
double InterestRate; //Interest Rate in percentage used for the loan amount
double MortgageMonthlyPayment;
cout << "Enter a loan amount: ";
cin >> LoanAmount;
cout << "Loan amount is: $ " << LoanAmount << endl;
cout << "Enter Interest rate: ";
cin >> InterestRate;
cout << "Interest rate is: " << right << setw(8) <<InterestRate << "%" << endl << endl;
cout << "Enter term: ";
cin >> term; // Total years for paying off mortgage loan
cout << "Your term is: " << right << setw(2) << term << " years" << endl << endl;
//Mortgage monthly calculation
MortgageMonthlyPayment = (LoanAmount* pow((1+ InterestRate/100/12),term*12)* InterestRate/100/12)/((pow((1+InterestRate/100/12),term*12))-1); //Calculates the monthly mortgage payment
cout << "Mortgage monthly payment is: $ " << MortgageMonthlyPayment << endl;
//Allow user to loop back and enter new data or to just quit the program
while (letter != 'Q' && letter != 'Z')
return 0; //End of program
}
Nov 1 '06 #1
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5 Replies


P: 7
I am working on an assignment where I have to allow end-users to enter in data and to have C++ make a calculation. From there I have to set up a loop to allow users to go back and enter new data or just quit. I have the part down where the users are entering in information to get a calculation, but I am not understanding the part about looping to go back, any direction will be greatly appreciated. Here is my code for now:
//************************************************** *****
//Program: Calculations Payments
//Purpose: To calculate a mortgage monthly payment by the user entering input
// and to allow the user to enter new data if they wish or to just quit the program.
//Programmer: Cameron Faldeti
//Date: 10/30/06
//School: University of Phoenix
//Class: POS 440: Introduction To C++
//Instructor: John Williams
#include <iostream>
#include <iomanip>
#include <cmath> //Header file in order for a user to calculate math formulas
using namespace std;
int main()
{

//Variable declarations
double LoanAmount; //Loan amount entered by the user in order to calculate a mortgage monthly payment
int term; //Years entered by user to use for calcuating the monthly payment
double InterestRate; //Interest Rate in percentage used for the loan amount
double MortgageMonthlyPayment;
cout << "Enter a loan amount: ";
cin >> LoanAmount;
cout << "Loan amount is: $ " << LoanAmount << endl;
cout << "Enter Interest rate: ";
cin >> InterestRate;
cout << "Interest rate is: " << right << setw(8) <<InterestRate << "%" << endl << endl;
cout << "Enter term: ";
cin >> term; // Total years for paying off mortgage loan
cout << "Your term is: " << right << setw(2) << term << " years" << endl << endl;
//Mortgage monthly calculation
MortgageMonthlyPayment = (LoanAmount* pow((1+ InterestRate/100/12),term*12)* InterestRate/100/12)/((pow((1+InterestRate/100/12),term*12))-1); //Calculates the monthly mortgage payment
cout << "Mortgage monthly payment is: $ " << MortgageMonthlyPayment << endl;
//Allow user to loop back and enter new data or to just quit the program
while (letter != 'Q' && letter != 'Z')
return 0; //End of program
}
What you need to do is put your code in a DO WHILE LOOP. You are almost there. A Do While Loop will repeat your option menu until the user decides to quit.

something like this;

Do
{
//
cout << "Enter a loan amount: ";
cin >> LoanAmount;//etc...............

} while (letter != 'Q' && letter != 'Z');
Nov 1 '06 #2

P: 10
Thanks, I will give that a try and let you know how it works out. I appreciate it so much.

What you need to do is put your code in a DO WHILE LOOP. You are almost there. A Do While Loop will repeat your option menu until the user decides to quit.

something like this;

Do
{
//
cout << "Enter a loan amount: ";
cin >> LoanAmount;//etc...............

} while (letter != 'Q' && letter != 'Z');
Nov 1 '06 #3

P: 10
I went ahead and tried putting in a do while loop, however when I debug my program, I am getting this message:
Microsoft Visual C++ Debug Library
Debug Error!
Program:..
Module:..n_Files\University of Phoenix\POS 440\week 3\debug\week3.exe
File:
Run-Time Check Failure #3-The Variable 'number' is being used without being defined.
(press Retry to debug the application)
Than underneath I have the three buttons:
abort, ignore, cancel.

Here is my latest code is anybody has any suggestions:
//************************************************** *****
//Program: Calculations Payments
//Purpose: To calculate a mortgage monthly payment by the user entering input
// and to allow the user to enter new data if they wish or to just quit the program.
//Programmer: Cameron Faldeti
//Date: 10/30/06
//School: University of Phoenix
//Class: POS 440: Introduction To C++
//Instructor: John Williams
#include <iostream>
#include <iomanip>
#include <cmath> //Header file in order for a user to calculate math formulas
using namespace std;
int main()
{

//Variable declarations
double LoanAmount; //Loan amount entered by the user in order to calculate a mortgage monthly payment
int term; //Years entered by user to use for calcuating the monthly payment
double InterestRate; //Interest Rate in percentage used for the loan amount
double MortgageMonthlyPayment;
int number;
cout << "Enter a loan amount: ";
cin >> LoanAmount;
cout << "Loan amount is: $ " << LoanAmount << endl;
cout << "Enter Interest rate: ";
cin >> InterestRate;
cout << "Interest rate is: " << right << setw(8) <<InterestRate << "%" << endl << endl;
cout << "Enter term: ";
cin >> term; // Total years for paying off mortgage loan
cout << "Your term is: " << right << setw(2) << term << " years" << endl << endl;
//Mortgage monthly calculation
MortgageMonthlyPayment = (LoanAmount* pow((1+ InterestRate/100/12),term*12)* InterestRate/100/12)/((pow((1+InterestRate/100/12),term*12))-1); //Calculates the monthly mortgage payment
cout << "Mortgage monthly payment is: $ " << MortgageMonthlyPayment << endl;
//Allow user to loop back and enter new data or to just quit the program
do
{
cout << "Enter a loan amount: ";
cin >> LoanAmount;
cout << "Loan amount is: $ " << LoanAmount << endl;
cout << "Enter Interest rate: ";
cin >> InterestRate;
cout << "Interest rate is: " << right << setw(8) <<InterestRate << "%" << endl << endl;
cout << "Enter term: ";
cin >> term;
cout << "Your term is: " << right << setw(2) << term << " years" << endl << endl;
}while(number != '1' && number != '2');
cout << "To quit the program enter 1 or 2." << endl;
cout << "Enter a number: ";
cin >> number;
cout << endl; //ends while loop
return 0; //End of program
}
Nov 2 '06 #4

P: 10
I figured out why I could not get rid of the run-time error, it's because I needed a variable in my int number statement. I believe my program is working the way it should now. The purpose as I mentioned was to create a program that would calculate a monthly mortgage payment with a loan amount of 200000 with an interest rate of 5.75% with a 30 year time period. From there I had to set a loop to allow the user to go back and enter new data or quit. Here is my latest code:
//************************************************** *****
//Program: Calculations Payments
//Purpose: To calculate a mortgage monthly payment by the user entering input
// and to allow the user to enter new data if they wish or to just quit the program.
//Programmer: Cameron Faldeti
//Date: 10/30/06
//School: University of Phoenix
//Class: POS 440: Introduction To C++
//Instructor: John Williams
#include <iostream>
#include <iomanip>
#include <cmath> //Header file in order for a user to calculate math formulas
using namespace std;
int main()
{

//Variable declarations
double LoanAmount; //Loan amount entered by the user in order to calculate a mortgage monthly payment
int term; //Years entered by user to use for calcuating the monthly payment
double InterestRate; //Interest Rate in percentage used for the loan amount
double MortgageMonthlyPayment;
int number = 0;
cout << "Enter a loan amount: ";
cin >> LoanAmount;
cout << "Loan amount is: $ " << LoanAmount << endl;
cout << "Enter Interest rate: ";
cin >> InterestRate;
cout << "Interest rate is: " << right << setw(8) <<InterestRate << "%" << endl << endl;
cout << "Enter term: ";
cin >> term; // Total years for paying off mortgage loan
cout << "Your term is: " << right << setw(2) << term << " years" << endl << endl;
//Mortgage monthly calculation
MortgageMonthlyPayment = (LoanAmount* pow((1+ InterestRate/100/12),term*12)* InterestRate/100/12)/((pow((1+InterestRate/100/12),term*12))-1); //Calculates the monthly mortgage payment
cout << "Mortgage monthly payment is: $ " << MortgageMonthlyPayment << endl;
//Allow user to loop back and enter new data or to just quit the program
do
{
cout << "Enter a loan amount: ";
cin >> LoanAmount;
cout << "Loan amount is: $ " << LoanAmount << endl;
cout << "Enter Interest rate: ";
cin >> InterestRate;
cout << "Interest rate is: " << right << setw(8) <<InterestRate << "%" << endl << endl;
cout << "Enter term: ";
cin >> term;
cout << "Your term is: " << right << setw(2) << term << " years" << endl << endl;
MortgageMonthlyPayment = (LoanAmount* pow((1+ InterestRate/100/12),term*12)* InterestRate/100/12)/((pow((1+InterestRate/100/12),term*12))-1);
cout << "Mortgage monthly payment is: $ " << MortgageMonthlyPayment << endl;
break;
}
while(number != '0' && number != '1');
cout << "To quit the program enter 1 or 2." << endl;
cout << "Enter a number: ";
cin >> number;
cout << endl; //ends while loop
return 0; //End of program
}
If anybody has any suggestions or comments, please feel free to let me know.
Nov 2 '06 #5

P: 10
It took me a while to fully understand what you meant, here is my latest code:
//************************************************** *****
//Program: Calculations Payments
//Purpose: To calculate a mortgage monthly payment by the user entering input
// and to allow the user to enter new data if they wish or to just quit the program.
//Programmer: Cameron Faldeti
//Date: 10/30/06
//School: University of Phoenix
//Class: POS 440: Introduction To C++
//Instructor: John Williams
#include <iostream>
#include <iomanip>
#include <cmath> //Header file in order for a user to calculate math formulas
using namespace std;
int main()
{

//Variable declarations
double LoanAmount; //Loan amount entered by the user in order to calculate a mortgage monthly payment
int term; //Years entered by user to use for calcuating the monthly payment
double InterestRate; //Interest Rate in percentage used for the loan amount
double MortgageMonthlyPayment;
char quit;//Allows users to quit the program if they wish
quit = 'N'; //If users enter N, they will have the option to enter new data
quit = 'n'; //If users enter n, they will have the option to enter new data
//Allow user to loop back and enter new data or to just quit the program
do
{
cout << "Enter a loan amount: ";
cin >> LoanAmount;
cout << "Loan amount is: $ " << LoanAmount << endl;
cout << "Enter Interest rate: ";
cin >> InterestRate;
cout << "Interest rate is: " << right << setw(8) <<InterestRate << "%" << endl << endl;
cout << "Enter term: ";
cin >> term; //Total years for paying off a mortgage loan
cout << "Your term is: " << right << setw(2) << term << " years" << endl << endl;
//Mortgage monthly calculation
MortgageMonthlyPayment = (LoanAmount* pow((1+ InterestRate/100/12),term*12)* InterestRate/100/12)/((pow((1+InterestRate/100/12),term*12))-1);
cout << "Mortgage monthly payment is: $ " << MortgageMonthlyPayment << endl;
cout << "Press N if you want to enter new data, or press 1 or press 2 to quit the program." << "Choice is: " << endl; //Gives users a chance to continue or quit
cin >> quit;
}while(quit!= '1'&& quit != '2');
system("PAUSE");
return 0; //End of program
}
Nov 3 '06 #6

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