java while 循环练习题

一、求一个数的阶乘

代码：

import java.util.Scanner;

public class Operator02 {
	public static void main(String[] args) {

//	         
//		// 求阶乘
	
		Scanner sc = new Scanner(System.in);
	
		while (true) {
			int res = 1;
			int num = sc.nextInt();
			int n = num;
			
			if (n<=0) {
				System.out.println("整数输入不能为负数!");
				
			} else {
				while (n >= 1) {
					res = res * n;
					n = n-1;
					
							
					
				}
				System.out.println(num+"的阶乘是:"+res);
				
			}
			
			
		}
		
		
		
	}

}

二、求1-100 之间的奇数

代码:

public class While01 {
	public static void main(String[] args) {
		// 求1-100 之间的奇数
		int count = 0;
		
		while(count <100) {
			if (count%2 != 0) {
				System.out.println(count);
				
			}
			count++;// count 每次自增1 相当于count = count +1;
		}
		
	}
		

}