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教孩子学编程:04C++关系运算符&条件分支

  • 2026-02-05 08:14:40
教孩子学编程:04C++关系运算符&条件分支

今天讲程序的分支结构

程序的基本结构有三种：顺序、分支、循环， 这个是重点，考试要考。
顺序结构也即是按照语句的先后顺序，自上而下依次执行。而分支结构，在执行时，首先对情况（一般用关系表达式或逻辑表达式表示）进行判断，若表达式的值为True，则执行语句块，否则执行语句块B。也就是说，对于这种结构，程序运行时，只能根据情况选择其中一个分支来执行。循环结构下次再讲，这里不细说。
当然在讲解分支结构之前，先普及了两个单词：True和False。
在英语阅读理解题型中，经常有题判断对错的，对的写T，错误的写F。其实一直这样答题，但始终未能明确T和F的含义。这次刚好顺着这个方式，把T=True 真，F=Flase 假，给学生们普及了下。学生听完，恍然大悟。
关系运算符主要是
大于（>）
小于（<）
大于等于（>=）
小于等于（<=）
等于（==）
不等于（!=）
这些运算符返回一个布尔值：如果关系为真，则返回1（真）；如果关系为假，则返回0（假）
接下来就是上机练习，给了一个程序样例，进行演练。
下一步的重点安排
目前瓶颈依然是最键盘的操作不熟练，网上找了一个练习打字的页面，叫哪吒打字，我自己了试了下，效果不错，下次课前可以提前练习30分钟，平时在家也可以练习。
下节课会先暂停下进度， 刚好学了分支语句，可以练习一个一直很想练的“数字炸弹”游戏。算是对这段时间学的东西进行总结，也能增加学习乐趣。
本文来自网友投稿或网络内容，如有侵犯您的权益请联系我们删除，联系邮箱：wyl860211@qq.com 。

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  137. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-template/src/template/driver/File.php ( 2.41 KB )
  138. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-template/src/template/contract/DriverInterface.php ( 0.86 KB )
  139. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/runtime/temp/067d451b9a0c665040f3f1bdd3293d68.php ( 11.98 KB )
  140. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000444s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000735s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000294s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000283s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000470s ]
  6. SELECT * FROM `set` [ RunTime:0.001598s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000594s ]
  8. SELECT * FROM `article` WHERE `id` = 465684 LIMIT 1 [ RunTime:0.002382s ]
  9. UPDATE `article` SET `lasttime` = 1770507499 WHERE `id` = 465684 [ RunTime:0.012988s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000317s ]
  11. SELECT * FROM `article` WHERE `id` < 465684 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000429s ]
  12. SELECT * FROM `article` WHERE `id` > 465684 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000386s ]
  13. SELECT * FROM `article` WHERE `id` < 465684 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.018366s ]
  14. SELECT * FROM `article` WHERE `id` < 465684 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.028537s ]
  15. SELECT * FROM `article` WHERE `id` < 465684 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.125232s ]
0.261518s