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Thread: Problem with if

  1. #1
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    Post Problem with if

    import java.util.Scanner;

    public class aritmetik {

    public static void main(String[] args) {
    Scanner keyboard = new Scanner(System.in);

    int tal1, tal2, result;

    System.out.print("Enter a number: ");
    tal1 = keyboard.nextInt();
    System.out.print("Enter another number: ");
    tal2 = keyboard.nextInt();

    System.out.println("How much is: " +tal1 + "+" +tal2);
    result = keyboard.nextInt(tal1 + tal2);


    if(tal1 + tal2 == result){
    System.out.println("The answer was correct!");
    }else{
    System.out.println("The answer was wrong!");
    }
    }
    }


    In future purposes I will add some kind of a loop (when I´ve learned a bit about it) and asking the user again and again if the answer is wrong. But for now I just want this code to work.

    Something is wrong with the If statement, dont really now what but I get this error message:
    Exception in thread "main" java.util.InputMismatchException: For input string: "8"
    at java.util.Scanner.nextInt(Scanner.java:2097)
    at aritmetik.main(aritmetik.java:16)


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Problem with if

    What is the value of expression in the call to nextInt() on line 16?
    Why are you using those args with the nextInt() method?
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Problem with if

    Quote Originally Posted by Norm View Post
    What is the value of expression in the call to nextInt() on line 16?
    Why are you using those args with the nextInt() method?
    @Norm I really don´t know. Just started programming two days ago. Suggestions?

  4. #4
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    Default Re: Problem with if

    I made it work Norm ;D


    import java.util.Scanner;

    public class aritmetik {

    public static void main(String[] args) {
    Scanner keyboard = new Scanner(System.in);

    int tal1, tal2, resultat;

    System.out.print("Ange ett heltal: ");
    tal1 = keyboard.nextInt();
    System.out.print("Ange ett till heltal: ");
    tal2 = keyboard.nextInt();

    System.out.println("Vad blir: " +tal1 + "+" +tal2 +"?");
    resultat = keyboard.nextInt();

    if(resultat == tal1 + tal2){
    System.out.println("Du svarade rätt");
    }else{
    System.out.println("Du svarade fel");
    }
    }
    }

    Sometimes you just gotta think things through a couple of times. Now I want to tweak my code, I want to make a loop where the program asks the user if he wants to continue with a new number YES/NO if yes then make the process once more. Is it a do loop?

  5. #5
    Super Moderator Norm's Avatar
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    Default Re: Problem with if

    Yes, a do{}while() would work.
    If you don't understand my answer, don't ignore it, ask a question.

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