正确的做法是使用typedef类型定义来明确变量的数据类型。 #include <stdio.h>#define INT32 inttypedef int int32;int main(){//unsigned int32 a = 10; C中typedef不支持这种类型的扩展,不能当成简单的宏替换unsigned INT32 a = 20; //宏简单替换,可以return 0;} 在typedef中,INT32类型仅被视为一种新...
typedef struct fruit {int weight, price_per_lb } frt; //将struct fruit命名为frt struct fruit {int weight, price_per_lb } apple;//定义struct fruit, 并创建struct fruit类型的变量 apple 这就是上面说的情况, 用typedef只是在创建变量时, 省去不用写struct struct fruit lemon; frt lemon; 虽然很多...
typedef struct fruit {int weight, price_per_lb } frt; //将struct fruit命名为frt struct fruit {int weight, price_per_lb } apple;//定义struct fruit, 并创建struct fruit类型的变量 apple 这就是上面说的情况, 用typedef只是在创建变量时, 省去不用写struct struct fruit lemon; frt lemon; 虽然很多...
// 函数类型、函数名的语言链接属性示例extern"C"voidf1(void(*pf)());// declares a function f1 with C linkage,// which returns void and takes a pointer to a C function// which returns void and takes no parametersextern"C"typedefvoidFUNC();// declares FUNC as a C function type that r...
7、t.x,ret.y,ret.z); return 0;文件 b.h 的内容:#ifndef _B_H#define _B_H#if 1typedef structint x;int y;int z;A_class;#endifextern A_class local_post; /外部结构体变量声明extern A_class fun(int x,int y,int z);/接口函数声明#endif文件 b.c 的内容:#include #include b.hA_...
sizeof:计算数据类型或变量长度(即所占字节数)static :声明静态变量struct:声明结构体类型switch :用于开关语句typedef:用以给数据类型取别名unsigned:声明无符号类型变量或函数union:声明共用体类型void :声明函数无返回值或无参数,声明无类型指针volatile:说明变量在程序执行中可被隐含地改变while :循环语句的循环条件...
/*** ERROR ***///*.hstructstr{inta;intb; };structstr str1 = {0,1};//.c 文件引用externstructstr str1; /*** SUCCESS ***///*.htypedefstruct{inta;intb; }str; str str1= {0,1};//.c 文件引用externstructstr str1;
,int);}编译器就会知道 add(1, 0);调用的C风格的函数，就会知道去找add符号而不是_Z3addii ；
using R_t = struct { int a; }; using R_p = R_t*; The checker ignores `typedef` within `extern "C" { ... }` blocks. .. code-block:: c++ extern "C" { typedef int InExternC; // Left intact. } This check requires using C++11 or higher to run. Options @@ -37,3 +45...
dear all, i defind a struct in a head file and other file will be use this struct , i use keyword extern but always has warning or error message , please tell me really method. thanks a lot. main.c --- typedef union{ unsigned...