Write a program that prompts the user for an integer and then prints out all prime numbers up to that integer.

Write a program that prompts the user for an integer and then prints out all prime numbers up to that integer.

Program Code in JAVA:

import java.io.*;

class Primenos

{

public static void main(String[] args) throws Exception

{

int n,fact;

System.out.println("Enter the range of Prime number you want");

DataInputStream dis=new DataInputStream(System.in);

n=Integer.parseInt(dis.readLine());

System.out.println("Prime No's from 1 to "+n+" is");

for(int i=1;i<=n;i++)

{

fact=1;

for(int x=1;x<i;x++)

if(i%x==0)

fact++;

if(fact==2)

System.out.print(i+"\t");

}

}

}

Program Output:

c:\java>javac Primenos.java

c:\java>java Primenos

Enter the range of Prime number you want 50

Prime No's from 1 to 50 is

2 3 5 7 11 13 17 19 23 29 31 37 41 43 47