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Thread: Beginner help with a do loop

  1. #1
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    Post Beginner help with a do loop

    import java.util.Scanner;
     
    public class aritmetik {
     
    	public static void main(String[] args) {
    		Scanner keyboard = new Scanner(System.in);
     
     
    		int resultat, tal1, tal2;
     
    	System.out.print("Enter a digit:  ");
    	tal1 = keyboard.nextInt();
    	System.out.print("Enter another digit: ");
    	tal2 = keyboard.nextInt();
     
     
    	System.out.println("How much is: " +tal1 + "+" +tal2 +"?");
    		resultat = keyboard.nextInt();
     
     
    		if(resultat == tal1 + tal2){
    			System.out.println("Your answer was right!");
    		}else{
    			System.out.println("Your answer was wrong.");
     
    			}
     
    		}
    }

    Hey,
    I'm a total newbie to Java programming. Itīs a course i'm taking in the university. Itīs actually a lot of fun (when it works) not so fun when it doesn't

    Anyway I've managed to program whats above, and it works fine. But I would like to tweak it a bit. I want to the program, say if you answer right: the program asks you if you would like to continue doing the same process again (but entering other digits) and if you answer wrong it will say: wrong answer, try again and let you enter the sum once more until you are right.

    I have watched I think 5 different youtube-videos about loops. I think a Do loop would be the case for me. But I have no idea how to implement it. Could someone be helpful and show me a bit for starters so that I have something to go on with

    Thanks!


  2. #2
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    Default Re: Beginner help with a do loop

    Do loop would be the case for me. But I have no idea how to implement it.
    Look at the tutorial for how to code a do{}while loop:
    The while and do-while Statements (The Java™ Tutorials > Learning the Java Language > Language Basics)

    If you have problems coding it, post the code and and explanation of the problem.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Beginner help with a do loop

    import java.util.Scanner;
     
    public class beraknaTal {
     
    	public static void main(String[] args) {
    		Scanner keyboard = new Scanner(System.in);
     
     
    		int resultat, tal1, tal2;
     
    	System.out.print("Ange ett heltal: ");
    	tal1 = keyboard.nextInt();
    	System.out.print("Ange ett till heltal: ");
    	tal2 = keyboard.nextInt();
     
    	do{	
    	System.out.print("Vad blir: " +tal1 + "+" +tal2 +"?");
    		resultat = keyboard.nextInt();
    	}
    		while (resultat != tal1 + tal2);
    			System.out.println("Du svarade rätt");
     
    	}
     
    			}

    Oh, it was not that hard. I have made it this far now, but I think it gets a bit tricky now. I would like the program to ask would you like to continue YES / NO. If YES go back to the beginning, if no say Ok (or something)?
    How is that made =/

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    Default Re: Beginner help with a do loop

    Put the code to be repeated inside the do{} while loop. Just before the end of the loop, ask the question and use the response to determine if to exit the loop or repeat the loop.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Beginner help with a do loop

    Basically you want to create a boolean variable and set it to false, then wrap your code in a do while loop...

    (in pseudo-code)

     
    do {
     
    do stuff here....
     
    Do you want to continue doing stuff? Yes(true) or No(false)
     
    } while(true)

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