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elizabeth brandon
prime numbers application
1 Answer(s)      4 years and 2 months ago
Posted in : Java Beginners


how to add a comment indicating that the method will determine if a number is a prime number. In the next line add the method header for this method which will be called isPrime. This method returns the value of a type boolean and takes an argument of type int, the parameter will be named number. Add a left brace on next line. in the body of the method add a comment stating that 1 is not a valid prime number, on the next line add an if statement to test whether the value of the parameter number is equal to 1.


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October 22, 2010 at 10:58 AM


Hi Friend,

Try the following code:

import java.util.*;

class CheckPrime{
    static boolean isPrime(int number){
        boolean isPrime = false;
        int i = (int) Math.ceil(Math.sqrt(number));
        while (i > 1) {
        if((number != i) && (number % i == 0)) {
            isPrime = false;
            break;
            } else if (!isPrime)
            isPrime = true;
            --i;
        }
        return isPrime;
    }
    public static void main(String[] args){
            int num = 5;
            if (isPrime(num)) {
                    System.out.println("Number is Prime");
                }
                else{
                    System.out.println("Number is not Prime");
                }
    }
}

Thanks



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