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第7部分 程序执行方向:程序控制结构
阅读量:327 次
发布时间:2019-03-04

本文共 825 字,大约阅读时间需要 2 分钟。

第七章 1、程序逻辑

顺序结构:按照书写顺序执行选择结构:根据给定条件判断,决定执行某个分支程序段循环结构:在给定程序成立时,反复执行某个程序段

while循环:先判断,再执行do...while循环:先执行,后判断for循环:循环次数固定foreach循环:简写为for循环,用来遍历数组或集合框架

int[] nums = {1,23,4,55,100};for(int item:nums){System.out.print(item + " ");}// 外层循环一次,内层循环一遍for(int i = 1; i<10; i++){for(int j = 1; j<=i; j++){System.out.print(j + "" + i + "=" + ij + " ");break;}System.out.println("a");}System.out.println("继续运行...")

三目运算:if...else的简写实例:输出随机月份的天数int a = 1;int b =12;int num = (int)(Math.random()*(b - a + 1)) + 1;int day = 0;switch(num){case 1:case 3:case 5:case 7:case 8:case 10:case 12:day = 31;break;case 2:day = 28;break;default:day = 30;break;}System.out.println(num + "月有:" + day + "天!");

判断是否是闰年:int year = 2016;if(year%400==0 || year%4==0 && year%100!=0){System.out.println(year + "是闰年");}else{System.out.println(year + "不是闰年");}

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