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  1. #1
    UmairBaloch is offline Member
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    Post Default value in while loop

    I'm supposed to make a program that reads an integer between two given limits and determines if it's prime or composite. I've made this program using while loop and it runs successfully, what I want to do is that if I enter an integer outside the limits, it must show a message "The number is not valid"
    code is

    Java Code:
    import java.util.Scanner;
    
    class Pri{
    	public static void main(String a[]){
    		Scanner scan = new Scanner(System.in);
    		
    		System.out.print("Enter the Starting limit: ");
    		int strlmt = scan.nextInt();
    		
    		System.out.print("Enter the Ending limit: ");
    		int endlmt = scan.nextInt();
    		
    		System.out.print("Enter any number between given limit: ");
    		int num=scan.nextInt();
    		int count = 2, check = 0;
    while (count<=num){
    		if (num%count==0)
    			check++;
    			count++;
    		}
    		if (check>1)
    		System.out.print("The number is Composite");
    		else
    		System.out.print("The number is Prime"); 
    
    }
    }
    Java Code:
    I've tried (num<strlmt && num>endlmt);
    System.out.println("the number is not valid");
    but I dont know how to put this in loop
    Thanks.

  2. #2
    wsaryada is offline Senior Member
    Join Date
    Jun 2007
    Location
    Bali, Indonesia
    Posts
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    Default Re: Default value in while loop

    Use OR instead AND in this case. You can't have a number smaller then the start limit and bigger then the end limit at the same time.

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