May 18, 2017

Srikaanth Kumar

How to Get The Prime Numbers Between a Given Range


Q: How to get the prime numbers between a given range?

Ans:

package javaTutorial;

import java.util.ArrayList;
import java.util.Scanner;

public class GetPrimeNumbers{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        System.out.println("Enter a number from which you want prime number: ");
        int p1 = in.nextInt();
        System.out.println("Enter one more number till which you want prime number: ");
        int p2 = in.nextInt();
        ArrayList<Integer> prime = new ArrayList<Integer>();
        int i=2;
        for(int p=p1; p<=p2; p++){
            i=2;
            for(; i<10; i++){  
                if(p%i==0 && p!=i){
                    break;
                }
            }
            if(i==10){
                prime.add(p);
            }
        }
        System.out.println("Prime numbers between "+p1+" and "+p2+" are: ");
        for(int j=0; j<prime.size(); j++){
            System.out.print(prime.get(j).toString()+", ");
        }      
    }
}

Output:

Enter a number from which you want prime number:
10
Enter one more number till which you want prime number:
30
Prime numbers between 10 and 30 are:
11, 13, 17, 19, 23, 29,



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