From 5e33459d8b976090357d232a43493a3e14b4f0db Mon Sep 17 00:00:00 2001 From: light-city <455954986@qq.com> Date: Fri, 26 Jul 2019 20:32:06 +0800 Subject: [PATCH] update dir --- README.md | 1 + struct/ext | Bin 9616 -> 14536 bytes struct/ext_struct_func.cpp | 7 +- struct_class/README.md | 223 ++---------------------------- struct_class/ext | Bin 9616 -> 0 bytes struct_class/ext_struct_func.cpp | 28 ---- struct_class/sf | Bin 8992 -> 0 bytes struct_class/stff | Bin 9152 -> 0 bytes struct_class/struct_func | Bin 8768 -> 0 bytes struct_class/struct_func.c | 27 ---- struct_class/struct_func.cpp | 25 ---- struct_class/struct_func_func.cpp | 39 ------ struct_class/stu | Bin 9112 -> 0 bytes 13 files changed, 17 insertions(+), 333 deletions(-) delete mode 100755 struct_class/ext delete mode 100644 struct_class/ext_struct_func.cpp delete mode 100755 struct_class/sf delete mode 100755 struct_class/stff delete mode 100755 struct_class/struct_func delete mode 100644 struct_class/struct_func.c delete mode 100644 struct_class/struct_func.cpp delete mode 100644 struct_class/struct_func_func.cpp delete mode 100755 struct_class/stu diff --git a/README.md b/README.md index 60a8827..67357dd 100644 --- a/README.md +++ b/README.md @@ -19,6 +19,7 @@ - [x] [位域那些事](./bit) - [x] [extern那些事](./extern) - [x] [struct那些事](./struct) +- [x] [struct与class那些事](./struct_class) 代码运行： 全部在linux下用vim编写，使用gcc/g++调试！全部可正常运行！ diff --git a/struct/ext b/struct/ext index d450b9f8ebe93e7a673deaa6071f30abb5bdd080..45104f89893cae70439235bf4bab081661c77884 100755 GIT binary patch literal 14536 zcmeHO4QyN2b-pAeTmGXc*GW{niD=hJl?J9MTbAWEKcxOlI=?t|= z%zfv+d&tKpaxFSwKmlEd@7(iy&pr3P``)|v=nI|QU3QyIaIuSf1!426e3E2bg?Pm) zQAKMNtAtOu#jRomDAoA+B!{3;W4NeHGptc^4!|n>TI~j*)$WrOhMzFVf+2fIklHI2 zpQ;-06YC9>p@5fENRNEY-AWk2ff9I5`SAofC5u~LiA;Jmw@DOmKvo!DQ;sp@{*f8_ zg_PZp-3N?t9|6%JuSLks_WneVQhm{B2rN2%vcm9jgDe=b-UHAhKY!KYQi2CndzIo+ zul#4Ix+}Ji#0OiNw~s`(jl>g~@onR+E!$d}J?W%phwL}mC)vF{hh$3}M>jC?c>{hl z2Z(>=_nxnP`Kxct?CbbZ)p!4K)8 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zKEXL&PWu;NyToSCc?J(T1v&Md^2^Yn5a}Hz;`_YsL)yOv8(L~?&-pd}_ajrP|7tnr z;^BTBhpoMR&TnL?Qy^!&EHnQzbnN!IJcw#QmtOKeY{xw7u;+WNuIxEZ_P};5UqXQ} z?mwUNJC)%{R#e<+??&(xf0aXz?Ke4a(j{WP6lHE(R;Zsd>cd5U #include - +using namespace std; struct Base { int v1; // private: //error! @@ -10,10 +10,14 @@ struct Base { virtual void print(){ printf("%s\n","Base"); }; + Base(){cout<<"Base construct"<print(); + delete b; return 0; } diff --git a/struct_class/README.md b/struct_class/README.md index c8d304d..119e039 100644 --- a/struct_class/README.md +++ b/struct_class/README.md @@ -1,222 +1,19 @@ -# 一文搞懂C和C++中struct +# struct与class区别 -## 1.C中struct +## 关于作者： -- 在C中struct只单纯的用作数据的复合类型，也就是说，在结构体声明中只能将数据成员放在里面，而不能将函数放在里面。 -- 在C结构体声明中不能使用C++访问修饰符，如：public、protected、private 而在C++中可以使用。 -- 在C中定义结构体变量，如果使用了下面定义必须加struct。 -- C的结构体不能继承（没有这一概念）。 -- 若结构体的名字与函数名相同，可以正常运行且正常的调用！例如：可以定义与 struct Base 不冲突的 void Base() {}。 +个人公众号： -完整案例： +![](../img/wechat.jpg) -```c -#include +关于C与C++中struct内容：见[struct那些事](../struct) -struct Base { // public - int v1; -// public: //error - int v2; - //private: - int v3; - //void print(){ // c中不能在结构体中嵌入函数 - // printf("%s\n","hello world"); - //}; //error! -}; +总的来说，struct 更适合看成是一个数据结构的实现体，class 更适合看成是一个对象的实现体。 -void Base(){ - printf("%s\n","I am Base func"); -} -//struct Base base1; //ok -//Base base2; //error -int main() { - struct Base base; - base.v1=1; - //base.print(); - printf("%d\n",base.v1); - Base(); - return 0; -} -``` +区别: -最后输出： +最本质的一个区别就是默认的访问控制 -``` -1 -I am Base func -``` +默认的继承访问权限。struct 是 public 的，class 是 private 的。 -完整代码见：[struct_func.c](./struct_func.c) - -## 2.C++中struct - -与C对比如下： - -- C++结构体中不仅可以定义数据，还可以定义函数。 -- C++结构体中可以使用访问修饰符，如：public、protected、private 。 -- C++结构体使用可以直接使用不带struct。 -- C++继承 -- 若结构体的名字与函数名相同，可以正常运行且正常的调用！但是定义结构体变量时候只用用带struct的！ - -例如： - -> 情形1：不适用typedef定义结构体别名 - -未添加同名函数前： - -```c++ -struct Student { - -}; -Student(){} -Struct Student s; //ok -Srudent s; //ok -``` - -添加同名函数后： - -```c++ -struct Student { - -}; -Student(){} -Struct Student s; //ok -Srudent s; //error -``` - -> 情形二：使用typedef定义结构体别名 - -```c++ -typedef struct Base1 { - int v1; -// private: //error! - int v3; - public: //显示声明public - int v2; - void print(){ - printf("%s\n","hello world"); - }; -}B; -//void B() {} //error! 符号 "B" 已经被定义为一个 "struct Base1" 的别名 -``` - -> 前三种案例 - -```c++ -#include -#include - -struct Base { - int v1; -// private: //error! - int v3; - public: //显示声明public - int v2; - void print(){ - printf("%s\n","hello world"); - }; -}; - -int main() { - struct Base base1; //ok - Base base2; //ok - Base base; - base.v1=1; - base.v3=2; - base.print(); - printf("%d\n",base.v1); - printf("%d\n",base.v3); - return 0; -} -``` - -完整代码见：[struct_func.cpp](struct_func.cpp) - -> 继承案例 - -```c++ -#include -#include -struct Base { - int v1; -// private: //error! - int v3; - public: //显示声明public - int v2; - virtual void print(){ - printf("%s\n","Base"); - }; -}; -struct Derived:Base { - - public: - int v2; - void print(){ - printf("%s\n","Derived"); - }; -}; -int main() { - Base *b=new Derived(); - b->print(); - return 0; -} -``` - -完整代码见：[ext_struct_func.cpp](./ext_struct_func.cpp) - -> 同名函数 - -```c++ -#include -#include - -struct Base { - int v1; -// private: //error! - int v3; - public: //显示声明public - int v2; - void print(){ - printf("%s\n","hello world"); - }; -}; - -typedef struct Base1 { - int v1; -// private: //error! - int v3; - public: //显示声明public - int v2; - void print(){ - printf("%s\n","hello world"); - }; -}B; -void Base(){ - printf("%s\n","I am Base func"); -} -//void B() {} //error! 符号 "B" 已经被定义为一个 "struct Base1" 的别名 -int main() { - struct Base base; //ok - //Base base1; // error! - base.v1=1; - base.v3=2; - base.print(); - printf("%d\n",base.v1); - printf("%d\n",base.v3); - Base(); - return 0; -} -``` -完整代码见：[struct_func_func.cpp](./struct_func_func.cpp) - -## 3.总结 - -### C和C++中的Struct区别 - -| C | C++ | -| ------------------------------------------------------ | ------------------------------------------------------------ | -| 不能将函数放在结构体声明 | 能将函数放在结构体声明 | -| 在C结构体声明中不能使用C++访问修饰符。 | public、protected、private 在C++中可以使用。 | -| 在C中定义结构体变量，如果使用了下面定义必须加struct。 | 可以不加struct | -| 结构体不能继承（没有这一概念）。 | 可以继承 | -| 若结构体的名字与函数名相同，可以正常运行且正常的调用！ | 若结构体的名字与函数名相同，使用结构体，只能使用带struct定义！ | \ No newline at end of file +struct 作为数据结构的实现体，它默认的数据访问控制是 public 的，而 class 作为对象的实现体，它默认的成员变量访问控制是 private 的。 diff --git a/struct_class/ext b/struct_class/ext deleted file mode 100755 index d450b9f8ebe93e7a673deaa6071f30abb5bdd080..0000000000000000000000000000000000000000 GIT binary patch literal 0 HcmV?d00001 literal 9616 zcmeHNeQ;b=6~Ea{nr&LP+wx&((Jt8159pGlX-HwDZ}ZW$_#&m%7@*j8|MI}wbILR36iSHH3?b2LQH;CiVCY23xy_D zifhCIAZ2(oSwq|^G0!U3%sooa4PJ_;-em#xE=?AgUt_^&!6J^3IJK82O%*Nv&|*tu zE`(nKWJj@PFOwp8w=6L4R&i8PV3PdumteB1^hy!DTNap4slb?X|EO>Dgp}WqOM^tR zMocux-#jN>qFt|=5i0jrND*9<1?CY87R=f1ldz*WKP>r_V!LW@zH#xW_?fHjikk*v zJ$1D=4Ma8!#Nz4U4a4$K#}(0Q^o6@-&`e{$s$e70X4ZuNx&HI_0kr 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-#include - -struct Base { - int v1; -// private: //error! - int v3; - public: //显示声明public - int v2; - void print(){ - printf("%s\n","hello world"); - }; -}; - -int main() { - struct Base base1; //ok - Base base2; //ok - Base base; - base.v1=1; - base.v3=2; - base.print(); - printf("%d\n",base.v1); - printf("%d\n",base.v3); - return 0; -} diff --git a/struct_class/struct_func_func.cpp b/struct_class/struct_func_func.cpp deleted file mode 100644 index bce3749..0000000 --- a/struct_class/struct_func_func.cpp +++ /dev/null @@ -1,39 +0,0 @@ -#include -#include - -struct Base { - int v1; -// private: //error! - int v3; - public: //显示声明public - int v2; - void print(){ - printf("%s\n","hello world"); - }; -}; - -typedef struct Base1 { - int v1; -// private: //error! - int v3; - public: //显示声明public - int v2; - void print(){ - printf("%s\n","hello world"); - }; -}B; -void Base(){ - printf("%s\n","I am Base func"); -} -//void B() {} //error! 符号 "B" 已经被定义为一个 "struct Base1" 的别名 -int main() { - 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