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Thread: Newb, working on Computer Science homework. Need ideas

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    Default Newb, working on Computer Science homework. Need ideas

    I know this is very simple for most, I am having a few issues understanding the coding. Pretty sure I am close to understanding but just can't make it there, especially with lack of sleep. Any help is greatly appreciated, I plan on sticking to these forums and learning as much as I can. I'm a computer science major also so it's very serious to me.

    I have started writing this Java program for homework in Netbeans 8.0 IDE. The project is as; "This program reads a monetary amount in cents and prints the smallest possible number of coins equaling the amount." I am trying to use 289 as a test in cents. It should be 2 Dollar Coins, 3 Quarters, 1 Dimes and 4 Pennies for a total of 10 coins. My program is giving me 13 coins and I am unsure how to get it to appear which ones. I've pondered on this and read online tutorials but it's not clicking in my head, sadly. I hope this is normal I am getting worried. Been changing the code around alot, also it has to be 'monetary'.

    import java.util.Scanner;
      public class Hw1 {
         public static void main(String [] args) {
            Scanner in = new Scanner(System.in);
     
            int cents; //input variables
            int dollars, quarters, dimes, nickels, pennies; //output   
     
     
            System.out.print("Enter an amount in cents:");
            amounts = in.nextInt();
     
            dollars = amounts/100;
            amounts = amounts%100;
     
            quarters = dollars/25;
            dollars = dollars%25;
     
            dimes = quarters/10;
            quarters = quarters%10;
     
            nickels = dimes/5;
            dimes = dimes%5;
     
            pennies = nickels/1;
            nickels = nickels%1;
     
     
            System.out.println("("+dollars+" Dollars, "+quarters+"       
            Quarters, "+dimes+" Dimes, "+nickels+" Nickels, "+pennies+"     
            Pennies )");
     
       }
     
    }
    Last edited by goodtanner; August 25th, 2014 at 07:45 PM. Reason: Highlighting and fixing format, changing a couple things.


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    Default Re: Newb, working on Computer Science homework. Need ideas

    Welcome to the forum! Please read this topic to learn how to post code in code or highlight tags and other useful info for new members.

    Please post your code correctly using code or highlight tags per the above link.

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    Default Re: Newb, working on Computer Science homework. Need ideas

    Hi,
    apart from posting unformatted code you've got the order wrong. Start with paper and pencil to find an algorythm. On paper you would certainly not start with trying to find the number of pennies to be returned.

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    Default Re: Newb, working on Computer Science homework. Need ideas

    Thanks,
    Sorry for the beginner mistakes, I am working hard to completely understand. Also my professor handed this assignment out at as the first one for homework with very little to no training. We do not have a text in this class either, so basically I used integer division to come up with the correct answer on paper before doing this. I dont know if you would call that an algorithm but I came up with the proper answer on paper. As far as the coding goes I didnt realize it would be in the same format as my math, if I have done what you said. Sorry for the newb mistakes, I am working on it.

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    Default Re: Newb, working on Computer Science homework. Need ideas

    Don't apologize for mistakes. They are part of the learning process. Regarding your problem: You have an amount of cents. First find out whether and how many dollars you can return. Next reduce the amount of cents by the dollars returned and find out whether and how many quarters you can return and so on. Division and the modulus operator are what you need:
    int amount = 234;
    int dollars = amount / 100;
    int remaining = amount % 100;
    I'm sure you'll get it.

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    Default Re: Newb, working on Computer Science homework. Need ideas

    I dont know if you would call that an algorithm but I came up with the proper answer on paper.
    It's an approach to a solution, and it provides you with a basis for writing code that will get you to a solution. Review your paper solution and use that to outline in code comments, pseudo-code, actual code, or some combination of all of those how the paper solution can be translated to a program solution.

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