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不是很理解判断字符tutorial02中连续判断数字的代码 (p++; ISDIGIT(*p); p++); #236

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liuxiaomingskm opened this issue Feb 9, 2023 · 2 comments
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不是很理解判断字符tutorial02中连续判断数字的代码 (p++; ISDIGIT(*p); p++); #236

liuxiaomingskm opened this issue Feb 9, 2023 · 2 comments

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@liuxiaomingskm
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Tutorail02Answer中下列代码 链接
for (p++; ISDIGIT(*p); p++);
不是很理解， 第一眼看上去因为p每次循环都自增2次 感觉应该会隔位判断，但是debug了一下 用12345 发现*p 显示如下
2 3 4 5
并没有跳过2,4 有点不太理解
@imdouyu
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imdouyu commented Feb 24, 2023

这里的第一个p++是跳过前一行已经做过判断的数字，第二个p++，是每次循环指针自增1，也就是循环开始后第一个p++不在参与循环的

@liuxiaomingskm
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是的哦 第一个p只是定义 忘了 谢谢指点~

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@liuxiaomingskm @imdouyu