cant figure out where to start

This is a discussion on cant figure out where to start within the C++ Programming forums, part of the General Programming Boards category; hi i have the "Starting out with C++" by Tony Gaddis 2nd Ed. and cant find the floppy is there ...

  1. #1
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    Question cant figure out where to start

    hi i have the "Starting out with C++" by Tony Gaddis 2nd Ed. and cant find the floppy is there a place u can download whats on it?..........my main problem is with chapter 3, page 151, Programing Challenge #13

    its shows this formula



    payment = Rate * (1+Rate)^n * L
    ((1+Rate)^n-1)



    and i am asked to make a program that asks for "n" , Rate, and "L" and displays a report simliar to this one
    Where; Rate = Interest rate, N=Number of payments, and L=Amount of the loan

    Loan Amount: $10000.00
    Monthly Interest Rate: 1%
    Number of Payments: 36
    Monthly Payment: $ 332.24
    Amount Paid back: $11957.00
    Interest Paid: $ 1957.00

    I cant figure out how to write the formula to get what it asks for? any ideas........i was thinking i use "POW"? but cant seem to find in my book anywhere if just gives the above example, since this is for class i dont want a complete answer......just alittle help figuring out how to use the formula.

    thanks

  2. #2
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    you'll have to use some sort of pow()

    its in math.h

    n to the power of 2 is
    pow(n,2);
    ADVISORY: This users posts are rated CP-MA, for Mature Audiences only.

  3. #3
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    haha i feel stupid i think i got it tell me if u think there is a easier way to write this

    M =((Rate2 * pow(1+Rate2,N))/(pow(1+Rate2,N)-1))*L;

  4. #4
    Has a Masters in B.S.
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    not that i can see.

  5. #5
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    okie here's a tuff one for ya.........i got it all made an it works great .........but how do i get all the numbers to line up
    EX.

    first day: 342
    second day: 234
    third day: 533

    something like that? i have tried all the SetIos flags i can think of an no change

  6. #6
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    Originally posted by ii3ejoe
    haha i feel stupid i think i got it tell me if u think there is a easier way to write this

    M =((Rate2 * pow(1+Rate2,N))/(pow(1+Rate2,N)-1))*L;
    I don't know if it'd be easier, but you could set the elements of the formula to variables and then use the formula.
    double x = 1 + Rate2;
    double y = pow(x, N);
    double z = Rate2 * y;
    and so on, so the top half of the formula would be M = z/(same type of thing bottom half). This may not be easier, but might be clearer to read.

  7. #7
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    Originally posted by ii3ejoe
    okie here's a tuff one for ya.........i got it all made an it works great .........but how do i get all the numbers to line up
    EX.

    first day: 342
    second day: 234
    third day: 533

    something like that? i have tried all the SetIos flags i can think of an no change
    Offhand, use setw(x) to cout the day followed by setw on the number. setw only works on the next value output. Something like:
    cout << setw(12) << "first day: " << setw(5) << num;

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