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Computer Applications

Write a program in Java to store 20 numbers in a Single Dimensional Array (SDA). Display the numbers which are prime.
Sample Input:

n[0]n[1]n[2]n[3]n[4]n[5]…n[16]n[17]n[18]n[19]
456577719067…82193152

Sample Output: 71, 67, 19, 31

Java

Java Arrays

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Answer

import java.util.Scanner;

public class KboatSDAPrimeNumbers
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        int arr[] = new int[20];

        System.out.println("Enter 20 numbers");
        for (int i = 0; i < arr.length; i++) {
            arr[i] = in.nextInt();
        }

        System.out.println("Prime Numbers:");
        for (int i = 0; i < arr.length; i++) {

            int c = 0;
            for (int j = 1; j <= arr[i]; j++) {
                if (arr[i] % j == 0) {
                    c++;
                }  
            }

            if (c == 2)
                System.out.print(arr[i] + ", ");
        }
    }
}

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Program Explanation

Output

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