Java program code to check prime numbers and find next prime number
Any integer greater than 1 that has only two factors (i.e. 1 and the number itself) is called a prime number. Apart from these two numbers, it has no other positive divisors. For example: 7 = 1 × 7
The following is the algorithm to determine whether a number is prime:
Get the integer variable A.
Divide variable A by (A-1 to 2).
If A is divisible by any value in (A-1 to 2), then it is not prime.
Otherwise it is a prime number.
Example
The following Java program accepts an integer input by the user, determines whether the given number is a prime number, and prints the next prime number.
import java.util.Scanner; public class NextNumberisPrime { public static int isPrime(int num){ int prime = 1; for(int i = 2; i < num; i++) { if((num % i) == 0) { prime = 0; } } return num; } public static int nextPrime(int num) { num++; for (int i = 2; i < num; i++) { if(num%i == 0) { num++; i=2; } else { continue; } } return num; } public static void main(String args[]){ Scanner sc = new Scanner(System.in); System.out.println("Enter a number ::"); int num = sc.nextInt(); int result = 0; int prime = isPrime(num); if (prime == 1) { System.out.println(num+" is a prime number"); } else { System.out.println(num+" is not a prime number"); } System.out.println("Next prime number is: "+nextPrime(num)); } }
Output
Enter a number :: 25 25 is not a prime number Next prime number is: 29
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