学习记录12

判断一个数是否为素数
import java.util.Scanner;

public class PrimeNumberChecker {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("请输入一个整数: ");
int number = scanner.nextInt();

    boolean isPrime = true;
    if (number <= 1) {
        isPrime = false;
    } else {
        for (int i = 2; i <= Math.sqrt(number); i++) {
            if (number % i == 0) {
                isPrime = false;
                break;
            }
        }
    }

    if (isPrime) {
        System.out.println(number + " 是素数。");
    } else {
        System.out.println(number + " 不是素数。");
    }
    scanner.close();
}

}