嵌入式Linux面试必备
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2023-02-11
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目录
面试必备 ........................................................................................................................................11
运算符 ............................................................................................................................................11
()[] ！ ++ -- &* /%* +- << >> >< &|^ &&|| ?: = += -= , .............................11
一、关键字篇 ................................................................................................................................13
1. Continue..............................................................................................................................13
2. Break ...................................................................................................................................13
3. Return .................................................................................................................................14
4. Goto ....................................................................................................................................14
5. Volatile ................................................................................................................................14
6.Struct(结构体) （和 C++区别，求结构体大小，使用的注意事项）.............................14
7.class 和 struct 的区别？......................................................................................................15
8.Union(联合体) .....................................................................................................................15
1. 对于联合体所有的成员都共享一块内存， ...........................................................15
2.联合体 union 和结构体 struct 的区别： ...................................................................15
3.联合体一般可以用来判断大小端问题： .................................................................16
4.大小端转换问题：......................................................................................................16
5.计算占用空间大小问题：..........................................................................................17
9.Enum ....................................................................................................................................19
10.Typedef ..............................................................................................................................19
1.#define 和 typedef 的区别 （宏，关键字，预处理，编译，检查）...................19
注意#define 和 typedef 定义指针的区别 .....................................................................19
typedef int (*funtion)() //表示函数指针，重新命名为 funtion................................19
11.Const （C 中的变量：局部，函数形成，返回值，指针，typedef 的区别，数组大小
定义，case C++：常函数，常对象）..............................................................................20
12.Extern（链接阶段） .........................................................................................................21
13.Register ..............................................................................................................................21
14.Auto ...................................................................................................................................21
15.Static (c 语言：变量、函数 C++：类中变量、类中静态成员函数) ....................21
1.定义变量 .....................................................................................................................22
2.定义函数 .....................................................................................................................24
3.定义类中的静态成员变量（不能在类里面初始化，不占类内存空间，必须定义才
能使用） ........................................................................................................................24
4.定义类中的静态成员函数(只能访问静态成员变量) .............................................25
16.Swicth case.........................................................................................................................25
17.Do while .............................................................................................................................25
18.Sizeof..................................................................................................................................25
1.Sizeof()和 strlen()的区别....................................................................................25
2.求指针大小.................................................................................................................26
3.计算数组大小..............................................................................................................26
4.如何不使用 sizeof 求数据类型字节的大小...............................................................26
#define mysizeof(value) (char*)(&value+1)-(char*)(&value)..........................................26
5.strlen(“ ”) = ? sizeof(“ ”);.........................................................................................26
6.sizeof(a++)....................................................................................................................27
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