write a program to find if the given integer is a prime number or not.
Answers
import java.util.Scanner;
public class PrimeNumberChecker
{
public static void main(String args[])
{
Scanner prince = new Scanner ( System.in );
double n = prince.nextDouble( );
int p = 0;
for ( int c = 1 ; c < = n ; c ++ )
{
if( n % c == 0 )
{
k = k + 1;
}
}
if( k == 2 )
{
System.out.println("Entered number is prime. ");
}
else
{
System.out.println(" Entered number is not prime.");
}
}
}
CODE :
import java.util.*;
class random
{
public static void main(String args[])
{
Scanner sc=new Scanner(System.in);
System.out.println("Enter a number to check whether the given number is prime number or not ");
int n = sc.nextInt();
int c = 0;
for(int i=1;i<=n;i++)
{
if(n%i==0)
{
c++;
}
}
if(c==2)
{
System.out.println("The entered number is a prime number");
}
else
{
System.out.println("The entered number is not a prime number");
}
}
}
Explanation:
Actually welcome to the concept of OOP ( Object Oriented Programming ) .
The main feature of OOP is that it not only gives equal importance to data and procedure but also protects data while using several principles called encapsulation , data hiding , abstraction .
JAVA uses the concept of OOP .
In JAVA , a class is a group of objects having some common characteristics and hence the class is known as object factory .
Object is nothing but an entity with unique properties .
We take user input with a package called java.util .
We use a special class called Scanner Class which helps in taking user inputs .
" A Prime Number Logic "
A prime number is a number which has exactly two factors - the number and itself . Hence we can take a number as input and then check the number of factors of the number in order to check whether a number is prime or not .
" Taking input "
Taking input needs the use of Scanner class as discussed earlier . We need to print a statement so that the users understands that he/she has to input something . The printing is done by "System.out.println" .
" Loop "
A loop is a repetition of many statements .
Here "for-loop" is used to execute the statements . The value of 'i' begins from 1 and goes till n .
This is similar to summation .
" If else statement "
Now the last portion of the code involves the use of if else statement .
Here we will check whether the number has two factors or more than two factors .
Hence we can easily find whether the number is prime or not .
OUTPUT in attachment .
