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Thread: composite and prime

  1. #1
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    Smile composite and prime

    import java.util.Scanner;
     
    	public class erelle{
    	    private static String comps;
    	    public static void main(String[] args){
    	        Scanner input = new Scanner(System.in);
    	        System.out.println("Please insert a number:");
    	        int number = input.nextInt();
    	        comps = "";
    	     	boolean  prime = isPrime(number);
    	        if(prime){
    	            System.out.println("The number "+number+" is Prime");
    	        }
    	        else{
    	            System.out.println("The number "+number+" is composed of "+comps);
    	        }
    	    }
    	    public static boolean isPrime(int num){
    	        boolean isTrue = true;
    	        for(int i=1; i<=Math.ceil((num/1)); i++){
    	            if(num%i == 0){
    	                if(comps.equals("")){
    	                    comps += ""+i;
    	                }
    	                else{
    	                    comps += ","+i;
    	                }
    	                isTrue = false;
    	            }
    	        }
    	        return isTrue;
    }
    	    }
    ..please help me in this code..there is no prime..
    Last edited by helloworld922; October 13th, 2010 at 04:56 PM.


  2. #2
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    Default Re: composite and prime

    Can you wrap your code in JAVA tags so we can read it easier? Look at my signature and try to give us those 3 things so we can help you better.

    I would assume you are attempting to create a program that does Prime Numbers. There are several recent posts regarding making a program that finds prime numbers.

    This is one of them: Need help.. Counting Prime #'s up to 50 w/while loop

    Do a quick search (Java Programming Forums - Search Results) and just skim the posts looking for information. If there is still an issue that has not been solved somewhere else or if something confuses you, we can work from there.
    NOTE TO NEW PEOPLE LOOKING FOR HELP ON FORUM:

    When asking for help, please follow these guidelines to receive better and more prompt help:
    1. Put your code in Java Tags. To do this, put [highlight=java] before your code and [/highlight] after your code.
    2. Give full details of errors and provide us with as much information about the situation as possible.
    3. Give us an example of what the output should look like when done correctly.

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  3. #3
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    Default Re: composite and prime

    ..this is a correct code but then the numbers that should be in prime the output would be in composite for example we input 1 the output would be the 1 is composed of 1..thank you..

  4. #4
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    Default Re: composite and prime

    1 is not prime.

    A number is considered prime if it's positive and divisible by any number greater than 1 and less than itself.

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