Introduction
In this tutorial we can make small program to check whether a number is a
prime or not depending upon the user input we tell them that the number
entered is prime or not.
Basically before going to the code part letters first define what is prime
number.
Q) what is prime number?
Ans) Prime number is a natural number which have not more than two
multiple to multiple.
Eg:- 2,3,5,7 and so on....
Now let's come on the code here are objective is to check whether user input
number is prime or not.
Q) write a Java program to check prime number?
Sol.
import java.util.Scanner;
public class primeNumber{
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
int num;
System.out.printf("enter number to
check for prime number");
num=in.nextInt();
if(num%2==0)
System.out.print(num +"is prime");
else
System.out.print(num + "is not a prime
number");
}
}
So above is the code to check whether a number is is prime or not , first the
we declare the variable called num so that we can store the user input
afterwards we put a message for user to enter a number, now we store that in
num , applying logic to check prime number we put that in a a if else
condition that if the logics get through do we have a message of the number is
prime or the number is not Prime if logic fails.
I am sure you now clearly understand how the program works to make you more
understandable let's go to the output.
Output:
enter number to check for prime number5
5is not a prime number
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