Question

Write a java programme to check whether the number is prime or not

Answer 1

import java.util.*;
public class Prime
{
public static void main(String args[]){
int num,loop;
boolean flag=false;
Scanner bf=new Scanner(System.in);
//input an integer number
System.out.print("Enter any integer number: ");
num= bf.nextInt();
//check prime
for(loop=2; loop<=(num/2); loop++)
{
if(num%loop==0)
{ flag=true;
break;
}
}
if(flag==false)
System.out.println(num + " is a prime number.");
else
System.out.println(num + " is not a prime number.");
}
}

Output

Enter any integer number: 79
79 is a prime number.