Java Program to Print Prime Numbers between 1 to N - The Coding Shala

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 In this post, we will learn how to display prime numbers between 1 to n using the Java program.

Java Program to Print Prime Numbers between 1 to N

Write a Java Program to print prime numbers between 1 to given n.

Example 1:
Input: 10
Output: 2
             3
             5
             7

Approach: 

We are going to check every number from 1 to n, if it is prime then will print it.

Prime numbers are only divisible by 1 and the number itself, so if the given number is divisible by any other numbers from 2 to n-1 then it's not a prime number.

Java Program: 

/**
 * https://www.thecodingshala.com/
 */

import java.util.Scanner;

public class Main {

    public static boolean checkPrime(int num) {
        if(num < 2) return false;

        for(int i = 2; i * i <= num; i++) {
            if(num % i == 0) return false;
        }
        return true;
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter the value of n");
        int n = sc.nextInt();
        System.out.println("Prime number from 1 to " + n + " are: ");
        for (int i=2; i <= n; i++) {
            if (checkPrime(i)) {
                System.out.println(i);
            }
        }
    }
}

Output: 

Enter the value of n
15
Prime number from 1 to 15 are: 
2
3
5
7
11
13


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