Break a while loop without using If or Break

Question

I need to create a program that uses while to find the volume of a cylinder. I need the while loop to break if the user inputs a negative value for the height. My code looks like this:

double sentinel=1, h=1, v=0, r, count=0; // declares all variables needed
    final double PI=3.14159;
    boolean NotNegative=true;

while(NotNegative){// && count==0){ // while both the height is positive AND the total times run is 0
        System.out.print("Enter height (Use negative to exit): "); // has the user input the height
        h=Double.parseDouble(br.readLine());
        sentinel=h; // save sentinel as the inputted height

        while(sentinel>0){

           System.out.print("Enter radius: "); // have the user input the radius
           r=Double.parseDouble(br.readLine());
           v=PI*(r*r)*h; // find the volume
           System.out.println("The volume is " + v); // print out the volume
           count++; // increase the count each time this runs
           NotNegative=true;
           sentinel=-1;
        }
    }

Any help?

And why don't you want break or if ?

Denys Séguret
– Denys Séguret

2012-12-03 17:00:05 +00:00
Commented Dec 3, 2012 at 17:00 — Denys Séguret
– Denys Séguret, Commented Dec 3, 2012 at 17:00
Is Math.PI too accurate? ;)

Peter Lawrey
– Peter Lawrey

2012-12-03 17:03:00 +00:00
Commented Dec 3, 2012 at 17:03 — Peter Lawrey
– Peter Lawrey, Commented Dec 3, 2012 at 17:03

Peter Lawrey · Accepted Answer · 2012-12-03 17:01:52Z

2

You can throw an Exception which you catch and ignore. This is bad idea as

if and/or break is more efficient and simpler.
it's slow
it's confusing.

However, since you are using a while loop, which is like using an if & break, you can do the following.

NotNegative = h >= 0;

answered Dec 3, 2012 at 17:01

Peter Lawrey

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Comments

Jiji · Accepted Answer · 2012-12-03 17:10:38Z

0

Add the following code inside the while(NotNegative){, after reading the input.

NotNegative = h >= 0;

answered Dec 3, 2012 at 17:10

Jiji

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