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Java program for Prime Number | Check whether Number is Prime or Not

mahmoud2506
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2022-05-06
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Java program for Prime Number | Check whether Number is Prime or Not

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mahmoud2506
2022-05-06
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Check Prime Number using Java Program

//Java program for Prime Number
 
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

    
    me@linux:~$ javac Prime.java 
    me@linux:~$ java Prime
    Enter any integer number: 79
    79 is a prime number.

 

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