VIP29/JavaSe01/day03/src/main/java/Exer04.java

import java.util.Scanner;

/**
 * ClassName: Exer02
 * Package: PACKAGE_NAME
 * Description:
 *
 * @Author 爱扣钉-陈晨
 * @Create 2023/9/17 10:33
 * @Version 1.0
 */
public class Exer04 {

    /*
        键盘输入一个数字.判断其是否是 素数( 素数只能被1-本身整除的数字 )
     */
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入正整数");
        int num = scanner.nextInt();

        // 2 - 数字 - 1
        // 标识
        boolean flag = true;

        for (int i = 2; i < num; i++) {
            if ( num % i == 0 ){
                flag = false;
            }
        }

        //判断 标识
        if (flag){
            System.out.println(num+"是素数");
        }else{
            System.out.println(num+"不是是素数");
        }
    }
}