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Thread: While loop stopping?

  1. #1
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    Default While loop stopping?

    I've done the work by hand several times using 25 and I get 5 for an answer but when I run the code it stops after the (second?) loop(by hand its Math.abs(13.5 - 1.9), returning 1.9). Am I missing something or did I screw up altogether? Thanks for your time.

    	static double abs (double b){
    		if (b < 0){
     
    		}
    		return (b*-1);
    	}
     
    	static double sqRoot(double n){
    		if (n<0)return -1;
    		double l = 1.0;
    		double r = n / l;
    		while(Math.abs(l - r) > (0.1)){
    			l = (l + r) / 2.0; 
    			r = n / l;
    		}
    	        return r;       
    	}


  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: While loop stopping?

    static double abs (double b){
            if (b < 0){
     
            }
            return (b*-1);
        }
    You're absolute value method is wrong. It will always return -b regardless if it's needed or not. I would strongly recommend using Java's built in absolute value method.

    Math.abs(-1); // 1
    Math.abs(1.234); // 1.234

  3. The Following User Says Thank You to helloworld922 For This Useful Post:

    Echo (October 16th, 2010)

  4. #3
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    Default Re: While loop stopping?

    Oh wow, thank you so much it works now.

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