[编程入门]自定义函数处理素数-Java-下水道-大牛勿入TAT

解题思路:先把"0","1", "2"用if处理掉,然后在for语句内用用2的倍数看被判断数是否能被整除....
注意事项:

参考代码:

public static void main(String[] args) {

Scanner in =new Scanner(System.in);

int x=in.nextInt();

int count=0;

if(x<=1) {

System.out.println("not prime");

}

if(x==2) {

System.out.println("prime");

}

if(x>2) {

for(int i=2;i<x;i+=2) {

if(x%i==0) {

count++;

}

}

}

if(count>0) {

System.out.println("not prime");

}

else {

System.out.println("prime");

}

}

}