58 lines
1.3 KiB
Java
58 lines
1.3 KiB
Java
package com.inmind;
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/*
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while循环的格式和使用
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循环变量初始化①
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while(循环条件②){
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循环体语句③
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修改循环变量④
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}
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执行顺序：①②③④>②③④>②③④…②不满足为止
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*/
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public class Demo04_while {
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public static void main(String[] args) {
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//使用while的语法，计算出1~100的偶数累和
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//定义一个变量记录总和
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int sum = 0;
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//循环变量的定义
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int i = 1;
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while (i <= 100) {
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//判断是否是偶数
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if (i % 2 == 0) {
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sum += i;
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}
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//修改循环变量
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i++;
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}
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System.out.println("结果为："+sum);
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System.out.println("程序结束");
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}
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//while循环的语法学习
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public static void whileMethod(String[] args) {
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//打印1~10
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int i = 1;
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while(i<=10){
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System.out.println(i);
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i++;
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}
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System.out.println("------------------");
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//打印10~1
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int j = 10;
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while (j>=1) {
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System.out.println(j);
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j--;
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}
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System.out.println("------------------");
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//打印A~Z
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int k = 'A';
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while (k <= 'Z') {
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System.out.println((char)k);
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k++;
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}
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}
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}
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