While循环

package com.study.scanner;

public class Demo06 {
    public static void main(String[] args) {
        int i = 0;
        while (i < 100){
            System.out.println(i);
            i++;
        }

//        0-100求和
        int x = 0;
        int sum = 0;
        while (x <= 100){
            sum += x;
            x++;
        }
        System.out.println(sum);
    }
}

while和do...while的区别
while先判断后执行，do...while先执行后判断
do...while总是保证程序会至少执行一次，