Prime number program in java

Interview Preparation

In this tutorial we are going to learn how to write a program to check whether a given integer number is prime number or not in Java programming language.

 

Read this: What is prime number? Prime number program in C.

How our Java program will work?

Our Java program will take one integer number as input.

Suppose if someone gives an input 5 (As we know 5 is Prime number) then our program will give output “given number is a prime number”.

And if someone gives 8  then output will be “given number is not a prime number”.

Java program to check given number is prime or not

import java.util.*;  
class Main{
    public static void main(String ...a){
    int i=0,temp=0;
    Scanner sc= new Scanner(System.in);
    System.out.print("Enter number- ");  
    int n= sc.nextInt();  
    for(i=2;i<=(n/2);i++){
		if(n%i==0)
		{
		temp=1;
		break;
		}
	}
	if(temp==1)
	    System.out.println("Number is not a prime");
	else
		System.out.println("Number is prime");
	}
}

Output:

java program to check number is prime or not

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