java - day07 - PrimeNum

判断质数

package day06;
import java.util.Scanner;

//验证质数
public class primeNum {
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        
        int num = scan.nextInt();
        int c　　ounter = 0;
        
        //算质数可能
        for(int i=2;i<num;i++){
            if(num%i == 0){
                counter++;   //可用boolean类型 做个flag进行判断
            }
        }
        
        //判断
        if(counter>0){
            System.out.println("输入值\t"+num+"\t不是质数");            
        }else{
            System.out.println("输入值\t"+num+"\t是质数");                        
        }
        scan.close();
    }
}