Write a program to display all prime numbers between two limits.

import java.io.*;
class Prime
{
public static void main(String arg[])throws IOException
{
    BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
    System.out.println("enter a positive lower limit");
    int l=Integer.parseInt(br.readLine());
    System.out.println("enter a positive upper limit");
    int u=Integer.parseInt(br.readLine());
    for(int n=l;n<=u;n++)
    {
        byte flag=1;
        for(int i=2;i<=(int)n/2;i++)
        {
            if(n%i==0)
            {
                flag=0;
                break;
            }
        }
        if(flag==1)
            System.out.print("\t" +n);
    }
}
}

Output

enter a positive lower limit
2
enter a positive upper limit
20
        2       3       5       7       11      13      17      19