C语言实验——判断素数(循环结构)

Problem Description

从键盘上输入任意一个正整数,然后判断该数是否为素数。
如果是素数则输出"This is a prime."
否则输出“This is not a prime.”

Input

输入任意一个正整数n(1 <= n <= 1000000)。

Output

判断n是否为素数,并输出判断结果:
如果n是素数则输出"This is a prime."
否则输出“This is not a prime.”

Sample Input

3

Sample Output

This is a prime.


import java.util.*; 
public class Main {

	public static void main(String[] args) {
		Scanner reader = new Scanner(System.in);
		int n;
		n = reader.nextInt();
		if(n==1){
			System.out.println("This is not a prime.");
		}
		else if(n>1&&n<=3){
			System.out.println("This is a prime.");
		}
		else{
			int flag = 0;
			for(int i=2; i

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