Question

My program won't print the amount interest. Can someone help me debug?

Answer 1

#include <iostream>
#include <cstdlib>
//*****************************************************
//Project: Interest
//Author:
//Purpose: Computes the interest on a credit card account balance.


//Notes: 9/23/12
//******************************************************
using namespace std;
//prototypes
double accountInterest(double intBal, double moRate, double numMonths);
double posDouble(string prompt);
void Print(double intBal, double moRate, double numMonths);

int main()
{

double numMonths=0;
double intBal=0;
double moRate=0;
double interest=0;
char answer=' ';
do
{
cout.setf(ios::fixed);
cout.setf(ios::showpoint);
cout.precision(2);
intBal=posDouble("Initial balance: $");
moRate=posDouble("Rate: ");
cout.precision(0);
numMonths=posDouble("Number of months: ");
interest=accountInterest(intBal, moRate, numMonths);

Print(intBal, moRate, numMonths);

cout<<"Would you like to repeat this calculation?"<<endl<<endl;
cout<<"Answer: ";
cin>>answer;
cout<<endl;

}while ((answer=='Y')||(answer=='y'));

system("PAUSE");
return 0;
}



double posDouble(string prompt)
{
double number;
cout<<prompt;
cin>>number;
cout<<endl;
while (number<=0)
{
cout<<"Enter a positive value."<<endl<<endl;
cout<<prompt;
cin>>number;
cout<<endl;
}
return number;
}


double accountInterest(double intBal, double moRate, double numMonths)
{
while (numMonths>0)
{
intBal=intBal*(1+(moRate/100));
numMonths--;
}

return intBal;
}



void Print(double intBal, double moRate, double numMonths)
{
double interest;
cout.precision(2);
cout<<"An initial balance of $"<<intBal<<" with a monthly"
<<" "<<"interest rate of ";
cout.precision(1);
cout<<moRate<<"%"<<" for "<<numMonths
<<" months yields";
cout.precision(2);
cout<<" $"<<interest<<"."<<endl<<endl;

}

Answer 2

it compiles here

Answer 3

true, it will compile, but it won't output the amount interest. by the way, what compiler are you using? is there a compiler on openstudy?

Answer 4

@bahrom7893

Answer 5

You're printing the wrong interest value.

You're not passing it through your print function, you're just defining it as a new double and never setting it.

you need to change this line:
Print(intBal, moRate, numMonths);
and this line:
void Print(double intBal, double moRate, double numMonths)

and remove this line:
double interest;

Answer 6

oh sorry, i opened it late last night and I thought that u said it wouldn't compile.

Answer 7

And I use Bloodshed wxDev-C++