Java Program to Print Prime Numbers

Prime numbers are the numbers that is only divisible by 1 and itself. 

Java Program to Print Prime Numbers

public class PrimeNumber
{
  public static void main(String[] args)
  {
    int n = 15;
    System.out.println("Prime Numbers :");
    for (int i = 1; i <= n; i++)
    {
     int c = 0;
     for (int j = 2; j <= i / 2; j++) 
     {
       if (i % j == 0) 
       {
         c++;
         break;
       }
     }

    if (c == 0) 
    {
     System.out.println(i);
    }
   }
 }
}

Output:

Prime Numbers :
1
2
3
5
7
11
13

Java Program to Print Prime Numbers From 1 to n

import java.util.Scanner;
public class PrimeNumber
{
  public static void main(String[] args)
  {
    Scanner sc = new Scanner(System.in);
    System.out.print("Enter the value of n:");
    int n = sc.nextInt();
    System.out.println("Prime Numbers :");
    for (int i = 1; i <= n; i++)
   {
     int c = 0;
     for (int j = 2; j <= i / 2; j++) 
    {
       if (i % j == 0) 
      {
         c++;
         break;
      }
    }

    if (c == 0) 
    {
     System.out.println(i);
    }
  }
 }
}

Output:

Enter the value of n:20
Prime Numbers :
1
2
3
5
7
11
13
17
19