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POtrying to limit the user to only entering a prime number
 

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  1. POtrying to limit the user to only entering a prime number
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    <p>im creating an application that encodes and decodes messages. Im using RSA cryptography so i need to work with prime numbers. Ive figured out how to tell if the numbers are prime or not with a method</p> <pre><code>public int checkPrime(int number) { //Is this number greater than 0 for(int i = number-1; i &gt; 0; i--) { if((number % i) == 0) { if(i == 1) { System.out.println("is a prime"); isPrime = true; } else { System.out.println("is not a prime"); isPrime = false; } break; } } return number; } </code></pre> <p>So this prints out if its prime or not. But what i want to do is to keep asking the user for a number if it is not prime. I ask the user to enter the input in a class called MenuMethods and then its response is set to variables which then create an instance of the Encrypt class.</p> <pre><code>//--------------------------------------------------------------------------------------- // Name: userInput // Description: This method is used in the MainApp to give the user capability to enter // the details when adding details of an employee into the store. //--------------------------------------------------------------------------------------- public static Encrypt userInput() { //String temp = keyboard.nextLine(); Encrypt encrypt = new Encrypt(); System.out.println("Please enter the Public Key: "); int publicKey = keyboard.nextInt(); encrypt.checkPrime(publicKey); System.out.println("Please enter the Private Key: "); int privateKey = keyboard.nextInt(); encrypt.checkPrime(privateKey); return encrypt = new Encrypt(publicKey,privateKey); } </code></pre> <p>Can someone please help me with this....</p>
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    1. USBecky O Brien
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      1. VTUpMod
    1. COWhat's going wrong?
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      1. USRoss Drew
    2. COMy problem is the questions are in the MenuMethods class and im confused about how to validate it to only let the user enter a prime :(
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      1. USBecky O Brien
    3. COUsually, the prime factory for RSA encryption are generated randomly. Why do you want the user to enter them?
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      1. USisnot2bad
 

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