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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>C++ Debuggerの日常</title> | |
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| class: center, middle | |
| # C++ Debuggerの日常 | |
| .right[三行·氰书] | |
| .right[献给陪伴我们整个青春的 C++ BUG 们] | |
| | |
| .right.font-small[修改自：知乎用户 w2014 https://www.zhihu.com/question/267697888/answer/331237351] | |
| --- | |
| # 被忘却的回忆 | |
| - 那些总是被遗忘的点点滴滴 | |
| --- | |
| # | |
| - 少写等号 | |
| ```c++ | |
| bool isequal(int x, int y) { | |
| if (x = y) | |
| return true; | |
| else | |
| return false; | |
| } | |
| /* | |
| * 纵然命运注定缠身 | |
| * 从此以往如路人 | |
| * 此情，此意，恒真 | |
| */ | |
| ``` | |
| --- | |
| # | |
| - 少写大括号 | |
| ```c++ | |
| if (a > b) | |
| c = a; | |
| a = b; | |
| b = a; | |
| /* | |
| * 这是一个悲伤的故事 | |
| * 他的心理满是她的影子 | |
| * 她的眸中却没有映出他的情意 | |
| */ | |
| ``` | |
| --- | |
| # | |
| - case 少写 break | |
| ```c++ | |
| switch (x) { | |
| case 1: printf("One"); | |
| case 2: printf("Two"); | |
| case 3: printf("Three"); | |
| } | |
| /* | |
| * 既然命运使我们在此相遇 | |
| * 我便要陪你走过一路荆棘 | |
| * 不离，不弃。 | |
| */ | |
| ``` | |
| --- | |
| # 逃不出的往事 | |
| - 循环的 100 种死法 | |
| --- | |
| # | |
| - 写错循环变量 | |
| ```c++ | |
| for (j = 1; j < 10; i++) { | |
| printf("%d ", a[j]); | |
| } | |
| /* | |
| * 一次又一次地徘徊 | |
| * 跳不出命运的安排 | |
| * 终究还是不能将你忘怀 | |
| */ | |
| ``` | |
| --- | |
| # | |
| - for 循环中对循环变量赋值 | |
| ```c++ | |
| for (i = 0; i < 5; i++) { | |
| printf("%d ", a[i--]; | |
| } | |
| /* | |
| * 多希望一切能重演 | |
| * 让我能回到一切的起点 | |
| * 留在遇到你的那一天 | |
| */ | |
| ``` | |
| --- | |
| # | |
| - while 条件无法满足（精度问题？） | |
| ```c++ | |
| while (sqrt(i - 1) * sqrt(i + 1) != 2 * sqrt(6)) { | |
| i++; | |
| } | |
| /* | |
| * 我一直都在等你着你回来 | |
| * 结果与你擦肩而过时我才明白 | |
| * 我的悲哀 | |
| */ | |
| ``` | |
| --- | |
| # | |
| - 递归没有退出条件 | |
| ```c++ | |
| int fibonacci(int x) { | |
| return fibonacci(x - 1) + fibonacci(x - 2); | |
| } | |
| /* | |
| * 昨天的牵挂 | |
| * 今天的思念 | |
| * 无止无尽，不休不眠，是溢出的爱恋 | |
| */ | |
| ``` | |
| --- | |
| # | |
| - 多次初始化 | |
| ```c++ | |
| while (s < 100) { | |
| s = 0; | |
| i++; | |
| s += a[i]; | |
| } | |
| /* | |
| * 如果有一天 | |
| * 你忘记了我们的从前 | |
| * 我会一遍遍讲给你听，直到永远 | |
| */ | |
| ``` | |
| --- | |
| # 终究还是柴米油盐 | |
| - 琐琐碎碎，零零散散，酸甜苦辣，嬉笑怒骂，才是生活应有的样子 | |
| --- | |
| # | |
| - 超出数据类型范围 | |
| ```c++ | |
| int i; | |
| i = 2147483648; | |
| /* | |
| * 他的心很小 | |
| * 记不住她的光环和荣耀 | |
| * 只放得下，她的一个拥抱 | |
| */ | |
| ``` | |
| --- | |
| # | |
| - 变量使用前没有初始化 | |
| ```c++ | |
| int s, i; | |
| for (i = 1; i < 100; i++) | |
| s += i; | |
| /* | |
| * 不能忘记的曾经 | |
| * 在现在仍留着残影 | |
| * 让我们的未来难以确定 | |
| */ | |
| ``` | |
| --- | |
| # | |
| - 交换变量的错误示范 | |
| ```c++ | |
| a = b; | |
| b = a; | |
| /* | |
| * 他把一切给了她 | |
| * 她把一切还给了他 | |
| * 却忘记了自己，只记得他 | |
| */ | |
| ``` | |
| --- | |
| # | |
| - 移动数组中变量的错误示范 | |
| ```c++ | |
| for (i = 0; i < n; i++) | |
| a[i + 1] = a[i]; | |
| /* | |
| * 每一天，都是一样的牵挂 | |
| * 每一刻，都是同样的思念 | |
| * 日复一日，直到永远 | |
| */ | |
| ``` | |
| --- | |
| # | |
| - 关于 define | |
| ```c++ | |
| #include <stdio.h> | |
| #define x 2 + 258 | |
| int main() { | |
| printf("%d\n", x * 2); | |
| return 0; | |
| } | |
| /* | |
| * 真的真的写不出文字来表达我的情意 | |
| * 可是我真的真的好像告诉你 | |
| * 我，爱你 | |
| */ | |
| ``` | |
| --- | |
| name: solution | |
| # 怕是要正经起来了 | |
| 说了好多问题 刚发现少了解决方案......... | |
| --- | |
| template: solution | |
| 不确定计算顺序时永远不要吝啬括号 | |
| Debug 时多输出中间变量 | |
| 适当利用步进调试 | |
| 变量记得赋初始值 | |
| 不要用浮点数判等 | |
| 对于循环，特别要留意退出前的最后几步，能否让循环正常退出 | |
| 减少递归。必须递归时要确定出口条件无误 | |
| 减少使用自己不确定的写法 | |
| --- | |
| # The End | |
| 感谢这些年来我们写出的种种 bug | |
| 一路陪我们走来 | |
| 使我们单调乏味的生活多了几分趣味 | |
| 又始终提醒着我们自己的弱点 | |
| 激励着我们不断进步 | |
| | |
| | |
| .right[via 从没给别人写过三行情书的某人] | |
| </textarea> | |
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