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();
     }
 }