Write a java program to take input of a number from the user and check whether the input number is a prime number or not. For each case print appropriate message.

In this post we will discuss a java program to take input of a number from the user and check whether the input number is a prime number or not. For each case print appropriate message.

import java.util.Scanner;
class PRIME
{
    public static void main()
    {
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter a number");
        int n=sc.nextInt();                        // the entered number will store in variable n
        int f=0;                                             //variable f is used as a counter
        if(n<=1)
        {
            System.out.println("Number is not Prime");
        }
        else if(n==2||n==3)
        {
            
            System.out.println("Number is prime");
        }
        else
        {
            
            for(int i=2;i<=n/2;i++)
            {
                if(n%i==0)
                {
                    System.out.print("Number is not prime");
                    f++;
                    break;
                }
            }
            if(f==0)
            System.out.println("Number is prime");
        }
    }
}


    

In this post i have shared a java program which is mostly asked by students of computer science.

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