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Thread: Need help with Java assignment

  1. #1
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    Default Need help with Java assignment

    Hi guys,

    I'm having trouble with this simple java exercise. You are supposed to make java print following lines:

    Insert first number:66
    Insert second number: 3
    66+3 = 69 System.out.println(summa = first + second);
    66-3 = 63 System.out.println(summa = first - second);
    66*3 = 198 System.out.println(summa = first * second);
    66/3 = 22.0 System.out.println(sum = first / second);
    66%3: 0 System.out.println(sum = first % second);

    the question is how you make it print it like that (66+3 = 69). I've posted the way i have written it.
    I have written the rest of the code such as getting the input etc. I only need to know you make it print numbers like that?

    Thanks


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Need help with Java assignment

    how you make it print it like that (66+3 = 69)
    The data types of the variables will determine how the compiler processes the + operand.
    It they are numeric (like int): 6 + 7 will return 13. If Strings: "6"+"7" will return "67"
    If you want the + to be included in the String enclose it in "s: "+"

    Can you post the code you are working with and the output that it creates to show the problem.
    Also post what you want the output to be.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Need help with Java assignment

    Thanks for the quick reply,

    Here's what I have come up with:

    import java.io.*;

    public class Lasku {
    public static void main(String[] args){
    int eka;
    int toka;
    int summa;

    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

    try{System.out.print("Syötä ensimmäinen kokonaisluku:");
    eka = Integer.parseInt(in.readLine());

    System.out.print("Syötä toinen kokonaisluku:");
    toka = Integer.parseInt(in.readLine());

    System.out.println(eka & toka + (summa = eka + toka));
    System.out.println(summa = eka - toka);
    System.out.println(summa = eka * toka);
    System.out.println(summa = eka / toka);
    System.out.println("Jakojäännös:" + (summa = eka % toka));

    }
    catch (Exception e){}
    }
    }

    Here's the output, dont worry about the language it's finnish

    Syötä ensimmäinen kokonaisluku: 66 <-- means insert first number
    Syötä toinen kokonaisluku: 3 <-- means insert second number
    69
    63
    198
    22
    Jakojäännös:0

    It should be:

    Syötä ensimmäinen kokonaisluku:66
    Syötä toinen kokonaisluku:3
    66+3 = 69
    66-3 = 63
    66*3 = 198
    66/3 = 22.0
    Jakojäännös: 0

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Need help with Java assignment

    66+3 = 69
    To get that to print out you need to print 5 different Strings:
    66
    +
    3
    =
    69

    You can build the full String to be printed by using the + operator to concatenate the individual Strings into a single String.
    Try printing this: 4 + "+" + 5
    It has three parts:
    4
    +
    5
    that are concatenated into one String with the + operator.
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: Need help with Java assignment

    Yeah that was it, now it works perfectly. Thanks alot

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