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38 lines (34 loc) · 1.13 KB
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package PrimeChecker;
import java.util.Scanner;
public class PrimeChecker {
public static void main(String[] args) {
if (args.length > 0) {
if (args.length == 1)
primeCheck(Integer.parseInt(args[0]));
else
System.out.println("[!] Available arguments: [number] ");
} else {
Scanner scan = new Scanner(System.in);
System.out.print("[->] Enter the number to check: ");
int number = scan.nextInt();
scan.close();
primeCheck(number);
}
} // end of main method
public static void primeCheck(int number) {
boolean isPrime = true;
if (number == 1)
isPrime = false;
else if (number < 1) {
System.out.println("[!] Please enter a natural number.");
return;
}
for (int i = 2; i <= Math.sqrt(number); i++) {
if (number % i == 0) {
isPrime = false;
break;
}
}
System.out.println("[x] " + number + (isPrime ? " is a Prime Number." : " is not a Prime Number."));
}
}