Programming project help?

This is a discussion on Programming project help? within the C++ Programming forums, part of the General Programming Boards category; im just having so much confusion trying to figure out the right math to compute the interest. I know Im ...

  1. #16
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    im just having so much confusion trying to figure out the right math to compute the interest. I know Im trying to calculate interest of each month...but the math statements throw me off. all i fized was the for loop. Other than that....im confused as to how i do the math calculations

    this is what i fixed:

    Code:
    #include <iostream>
    using namespace std;
    
    int main ( )
    {
    int months, count = 1;
    double init_Balance, rate, interest = 0, new_balance, total_Interest = 0, int_Accumulated;
    char repeats;
    
    
    do
    {
    total_Interest = 0;
    {
    cout << " Credit card interest\n ";
    cout << "Enter: Initial balance, monthly interest rate as a decimal fraction, e.g. for 1.5&#37; per month write 0.015, and the number of months the bill has run.\n ";
    cout << "I will give you the interest that has accumulated.\n ";
    
    cin >> init_Balance >> rate >> months;
    }
    for ( int count = 0; count < months; count++)
    {
    
    
    interest = ( rate * init_Balance );
    
    new_balance = ( init_Balance + interest );
    
    total_Interest = ( interest + );
    cout << count ++;
    
    
    }
    
    
    cout.setf(ios::fixed);
    cout.setf(ios::showpoint);
    cout.precision(2);
    {
    cout << "Interest accumulated = $\n";
    cin >> int_Accumulated;
    
    cout << "Y or y repeats, any other character quits. ";
    }
    }while ( repeats != 'Y' && repeats != 'y' );
    
    
    
    return 0;
    }

  2. #17
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    I fixed the first correction you told me to do...but im completely lost as to how i write the math statements in order to compute the interest for each month. How do i do that?

  3. #18
    Banned master5001's Avatar
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    There are formulas for compounding interest that one could use that do not require a for loop in order to work properly...

    I am not even going to torment my poor compiler with code that already looks uncompileable.

  4. #19
    Banned master5001's Avatar
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    Being no economist I had to look up the formula for non-continuous interest... so let me put some code, Debbie. And see if mine helps you at any capacity.

    Example:
    Code:
    #include <cmath>
    
    /*
     * A = P(1 + (r/n))^nt
     */
    double compoundInterest(double principal, double rate,
      double rate, double numberOfCompounds, double time)
    {
      return principal * pow(1.0 + (rate / numberOfCompounds), time * numberOfCompounds);
    }
    
    /*
     * A = Pe^rt
     */
    double continuousCompoundInterest(double principal, double rate, double time)
    {
      return principal * pow(M_E, rate * time);
    }

  5. #20
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    Do I need to write my math statements in a series inside the for loop? Or would I use 1 statement like...interest = (init_Balance * pow (( 1 + rate/100 , months ))) - init_Balance;

    I have no clue what to do? Can anyone help me? This is so frustrating?

  6. #21
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    disregard my last post.

  7. #22
    C++まいる!Cをこわせ!
    Join Date
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    Just a tip: but when you post your code, always make sure it's indented. This should not be a problem, since your original code should also be indented properly.
    Otherwise it becomes an unreadable mess.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

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