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POHow to write a simple Java program that finds the greatest common divisor between two numbers?
 

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  1. POHow to write a simple Java program that finds the greatest common divisor between two numbers?
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    <p>Here is the question:</p> <p>"Write a method named gcd that accepts two integers as parameters and returns the greatest common divisor of the two numbers. The greatest common divisor (GCD) of two integers a and b is the largest integer that is a factor of both a and b. The GCD of any number and 1 is 1, and the GCD of any number and 0 is that number.</p> <p>One efficient way to compute the GCD of two numbers is to use Euclid's algorithm, which states the following:</p> <pre><code>GCD(A, B) = GCD(B, A % B) GCD(A, 0) = Absolute value of A" </code></pre> <p>I'm really confused as to how to solve this problem. I just want some hints and tips as to what I did wrong in the program I have so far. (I have to put in a Scanner, that is my teacher's requirement.) Don't give me a full code as I kinda want to solve this out myself. Maybe just give me a hint on how I incorporate this formula that you see above. (And if you're wondering why I put in the == 0, it's because I thought that if you have two numbers, say 0 and 90, their GCD would be 0 right??)</p> <p>Also, my code has to include while loops...I would've preferred if loops...</p> <p>Thanks in advance! :)</p> <p>My current program:</p> <pre><code>public static void main(String[] args) { Scanner console = new Scanner(System.in); int a = console.nextInt(); int b = console.nextInt(); gcd (a, b); } public static void gcd(int a, int b) { System.out.print("Type in two numbers and I will print outs its Greatest Common Divisor: "); int gcdNum1 = console.nextInt(); int gcdNum2 = console.nextInt(); while (gcdNum1 == 0) { gcdNum1 = 0; } while (gcdNum2 &gt; gcdNum1) { int gcd = gcdNum1 % gcdNum2; } System.out.print(gcdNum1 + gcdNum2); } } </code></pre>
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    1. COHint - you need a recursive call.
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      1. POHow to write a simple Java program that finds the greatest common divisor between two numbers?
      1. USSergeyS
    2. COYou are passing `a` and `b` to your method as paramters, so there is no need to read them again from console (and `console` variable is not visible in the method, so your code won't compile anyway). Also, the first loop looks pretty infinite, if entered.
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    3. CO*I would've preferred if loops...* That's quite complicated since `if` is no loop
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