Question

[JAVA]

Write a program that prompts the user for an integer and displays if the provided integer is a prime number or not. A prime number is a number that is divisible only by 1 and itself. First few prime numbers are 2,3,5,7,11,13 and so on.

[using if-statements, and if-else-statement ]

Answer 1

import java.util.*;//imported for scanner class

public class prime {

public static void main(String[] args)

{

Scanner sc=new Scanner(System.in);//This class is used for obtaining inputs

int n,flag=0;

System.out.println("Enter a number to be checked whether is prime or not: ");

n=sc.nextInt();

if(n==1||n==0)

System.out.println("Number neither prime nor composite");

else

{

for (int i=2;i<n;i++)

{

if(n%i==0)

{

flag=0;

break;

}

else

flag=1;

}

if(flag==1)

System.out.println("It is a prime number");

else

{

System.out.println("It is a composite number(not prime)");

}

}

}

}