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Thread: need some help

  1. #1
    Phillip is offline Member
    Join Date
    May 2013
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    Default need some help

    hello everyone,

    I just started to do java and I'm suppose to solve an quadratic equation ax^2+bx+c=0.

    So everything works good, and im trying to put some restrictions on the equation like if a=0 do this , if square root=0 do this if both do this.

    the restriction works, the only problem is that every time I run the program both message shows off. What should I do?

    Java Code:
    System.out.println("Finding the solution to ax^2+bx+c=0");
          System.out.println("Write a value for a"); 
          double a = input.nextDouble();
          System.out.println("Write a value for b"); 
          double b = input.nextDouble();
          System.out.println("Write a value for c"); 
          double c = input.nextDouble();
          double square = (Math.sqrt(b*b-4*a*c));
          double x1 = (-b+square)/(2*a);
          double x2 = (-b-square)/(2*a);
          double xx1 = (-b+square);
          double xx2 = (-b-square);
          if (square > 0)
             System.out.println("x1= " +x1+ "  and x2= "+x2);
           System.out.println("Square root is 0 making x1 and x2 =" +-b/2*a);
          if (a>0)
             System.out.println("x1 = "+x1+ "   and x2 = "+x2);
          else {
             System.out.println("x1 = "+xx1+ "   and x2 = "+xx2);
    Last edited by Phillip; 05-23-2013 at 08:39 PM.

  2. #2
    JosAH's Avatar
    JosAH is offline Moderator
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    Sep 2008
    Voorschoten, the Netherlands
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    Default Re: need some help

    If 'square' isn't larger than zero it isn't necessarily equal to zero ... the same counts for 'a'.

    kind regards,


    ps. and be careful if you take the square root of a negative number.
    Build a wall around Donald Trump; I'll pay for it.

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