Java Primality Test

Java Primality Test

Problem Description:

A prime number is a natural number greater than 1 whose only positive divisors are 1 and itself. 

For example, the first six prime numbers are 2, 3, 5, 7, 11, and 13.

Given a large integer, n, use the Java BigInteger class' 

isProbablePrime method to determine and print whether it's prime or not prime.


Input Format

A single line containing an integer,  n(the number to be checked).


Constraints

n contains at most 100 digits.


Output Format:

If n is a prime number, print prime; otherwise, print not prime.


Sample Input

13


Sample Output

prime


Explanation

The only positive divisors of 13 are 1 and 13, so we print prime.



Solution:


import java.io.*;

import java.math.*;

import java.security.*;

import java.text.*;

import java.util.*;

import java.util.concurrent.*;

import java.util.regex.*;


public class Solution {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        BigInteger n = scanner.nextBigInteger();

        if(n.isProbablePrime(1)){

            System.out.println("prime");

        }

        else{

            System.out.println("not prime");

        }

        scanner.close();

    }

}


Reference: Java Primality Test

Comments

Post a Comment

Popular posts from this blog

Valid Username Regular Expression

Valid Username Regular Expression: Problem Description: You are updating the username policy on your company's internal networking platform. According to the policy, a username is considered valid if all the following constraints are satisfied: The username consists of 8 to 30 characters inclusive. If the username consists of less than  or greater than 8 characters, then it is an invalid username. The username can only contain alphanumeric characters and underscores (_). Alphanumeric characters describe the character set consisting of lowercase characters[a-z] , uppercase characters[A-Z] , and digits[0-9]. The first character of the username must be an alphabetic character, i.e., either lowercase character [a-z] or uppercase character [A-Z]. Update the value of regularExpression field in the UsernameValidator class so that the regular expression only matches with valid usernames. Input Format The first line of input contains an integer , describing the total number of usernames. Ea...
Read more

Rotate String in Right Direction in java

Rotate String in Right Direction in java: Program: import java.util.*; public class RotateString { public static void main(String[] args) { Scanner s = new Scanner(System.in); int n = s.nextInt(); char[] ch = new char[n]; for(int i=0;i<n;i++) { ch[i] = s.next().charAt(0); } int r = s.nextInt(); char temp = 'a'; r=r%n; while(r>0) { temp = ch[n-1]; for(int i = n-1; i>0;i--) { ch[i] = ch[i-1]; } ch[0] = temp; System.out.println("r: " + r); for(int i=0;i<n;i++) { System.out.print(ch[i]); } System.out.println(); r--; } for(int i=0;i<n;i++) { System.out.print(ch[i]); } } } Output : 5 a s d f g 3 r: 3 gasdf r: 2 fgasd r: 1 dfgas dfgas                                                            Happy Coding 💻:-)
Read more

Java MCQ's

1) Predict the output of following Java Programs. Program 1: // filename Main.java  class Test {      protected int x, y;  }  class Main {      public static void main(String args[]) {          Test t = new Test();          System.out.println(t.x + " " + t.y);      }  }  Output:  0 0 Explanation: In Java, a protected member is accessible in all classes of same package and in inherited classes of other packages. Since Test and Main are in same package, no access related problem in the above program. Also, the default constructors initialize integral variables as 0 in Java (See this GFact for more details). That is why we get output as 0 0. Program 2: // filename Test.java  class Test {      public static void main(String[] args) {          for(int i = 0; 1; i++) {              System.ou...
Read more