【C基础】课时6：C控制语句：分支和跳转

**本章要点**

![title](https://leanote.com/api/file/getImage?fileId=5e5a976bab644131960039ea)

**ctype.h系列的字符函数**

![title](https://leanote.com/api/file/getImage?fileId=5e5b6872ab64411fcb0022bb)

![title](https://leanote.com/api/file/getImage?fileId=5e5b6c59ab64411fcb00236f)

![title](https://leanote.com/api/file/getImage?fileId=5e5b6ccdab64411fcb002389)

![title](https://leanote.com/api/file/getImage?fileId=5e5b6d15ab64411fcb00239b)

**else与if配对**

![title](https://leanote.com/api/file/getImage?fileId=5e5b7246ab64411fcb002499)

**标记flag**

![title](https://leanote.com/api/file/getImage?fileId=5e5b7714ab644121d1002614)

**逻辑运算符**

![title](https://leanote.com/api/file/getImage?fileId=5e5b7cf7ab64411fcb002673)

**#include `<iso646.h>`**

![title](https://leanote.com/api/file/getImage?fileId=5e5b7d91ab64411fcb00269b)

**求值顺序**

因为`&&`是逻辑运算符，所以`&&`连接的条件，先左后右执行：

![title](https://leanote.com/api/file/getImage?fileId=5e5b893bab64411fcb0028cc)

![title](https://leanote.com/api/file/getImage?fileId=5e5b89ebab64411fcb0028e7)

**空白字符的判断**

![title](https://leanote.com/api/file/getImage?fileId=5e5b9146ab644121d1002b40)

**一些包含函数原型的头文件**

![title](https://leanote.com/api/file/getImage?fileId=5e5b923cab64411fcb002a5b)

**条件运算符：`?`**

![title](https://leanote.com/api/file/getImage?fileId=5e5b9345ab64411fcb002a8a)

![title](https://leanote.com/api/file/getImage?fileId=5e5b9360ab644121d1002b9f)

![title](https://leanote.com/api/file/getImage?fileId=5e5b94abab64411fcb002acc)

**循环辅助：continue和break**

![title](https://leanote.com/api/file/getImage?fileId=5e5b9525ab64411fcb002ae7)

![title](https://leanote.com/api/file/getImage?fileId=5e5b9562ab64411fcb002af7)

**while和for循环中continue的区别**

细品：

![title](https://leanote.com/api/file/getImage?fileId=5e5c7a0eab64411fcb005462)

而while中：

![title](https://leanote.com/api/file/getImage?fileId=5e5c7a6aab644121d100550f)

**break语句**

![title](https://leanote.com/api/file/getImage?fileId=5e5c7b32ab644121d1005537)

![title](https://leanote.com/api/file/getImage?fileId=5e5c7cd8ab64411fcb0054e6)

![title](https://leanote.com/api/file/getImage?fileId=5e5c7dbcab644121d10055ce)

**多重选择：switch和break**

switch 的用处：

![title](https://leanote.com/api/file/getImage?fileId=5e5c7e8fab644121d10055f2)

![title](https://leanote.com/api/file/getImage?fileId=5e5c8119ab64411fcb0055c4)

![title](https://leanote.com/api/file/getImage?fileId=5e5c81a0ab644121d100567f)

![title](https://leanote.com/api/file/getImage?fileId=5e5c8214ab64411fcb0055fc)

**丢弃一行中其他字符**

![title](https://leanote.com/api/file/getImage?fileId=5e5c8285ab64411fcb00560c)

![title](https://leanote.com/api/file/getImage?fileId=5e5c82afab644121d10056c3)

**一图看懂switch**

![title](https://leanote.com/api/file/getImage?fileId=5e5c874fab64411fcb0056fe)

**switch和if else**

![title](https://leanote.com/api/file/getImage?fileId=5e5c8830ab644121d10057be)

**break和continue的另一重理解**

![title](https://leanote.com/api/file/getImage?fileId=5e5c8907ab64411fcb005755)

**goto跳出嵌套循环**

![title](https://leanote.com/api/file/getImage?fileId=5e5c89b7ab64411fcb005776)

**本章小结**

![title](https://leanote.com/api/file/getImage?fileId=5e5c8a82ab644121d1005821)

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