AI代码解释 # define _CRT_SECURE_NO_WARNINGS1#include<stdio.h>#include<setjmp.h>jmp_buf env;//jmp_buf是一个预定义的数据类型,它用来描述一个环境的状态。//env是一个jmp_buf类型的变量。voidfunc(){//设置跳转点int ret=setjmp(env);if(0==ret){//正常流程printf("In func()\n");//触发跳转...
In C programming, header files serve as a way to declare function prototypes, types, and macros that can be shared across multiple source files. The syntax of header files typically consists of the following elements: #ifndef HEADER_NAME_H#define HEADER_NAME_H // Declarations and definitions ...
{ unsigned char header[2]; if (recv(socket_fd, header, 2, 0) != 2) { printf("Failed to receive message header!\n"); return -1 } unsigned int remaining_length = 0; unsigned int multiplier = 1; int i = 1; do { if (recv(socket_fd, &header[i], 1, 0) != 1) { printf...
#define MEM_W( x ) ( *( (word *) (x) ) ) 4、求最大值和最小值 #define MAX( x, y ) ( ((x) > (y)) ? (x) : (y) ) #define MIN( x, y ) ( ((x) < (y)) ? (x) : (y) ) 5、得到一个field在结构体(struct)中的偏移量 #define FPOS( type, field ) / /*lint...
#defineoffsetof(type,member)/*implementation-defined*/// byte offset from the beginning of a struct type to specified member// (function macro)/// Defined in header <stdbool.h> ///#definebool_Bool// (C99) conveniencemacro, expands to _Bool#definefalse0// (keyword macro) (until C23)((...
4, Type definition: Some new data types can be defined in the header file, which is convenient to use in different source files. For example, we can define a struct that represents a date and then reference that struct in other source files to improve the readability and maintainability of ...
#include <stdio.h> /*若a没有被定义就定义它*/ #ifndef a #define a 1 #endif int main(){ #if (a == 1) printf("a == 1\n"); #else printf("a != 1\n"); #endif return 0; } 和一般的条件语句不同的是,条件编译在compile之前就已经决定,相反的,正常的条件语句(if, else if, el...
在、 struct或enum class 類型內class宣告的標識碼,當您在該範圍之外使用這些標識碼時,也必須以其封入範圍的名稱來限定。 範例:先行編譯標頭不是第一個 如果您在先行編譯頭檔之前#include放置任何預處理器指示詞,例如#include、 #define或#pragma,就會發生此錯誤。 如果您的原始程序檔使用先行編譯頭檔(也就是使用...
稍后在源文件中定义它们/* file.h ... */#ifndef ...externint32_t my_variable; /* This is global variable declaration in header */#endif/* file.c ... */int32_t my_variable; /* Actually defined in source */不要把.c文件包含在另一个.c文件中.c文件应该首先包含相应的.h文件，然后...
#include#include "user_header.h"// bala bala #include就是包含头文件用的,不是吗?! 我之前也一直这么认为的,直到我看了某些大神写的代码,后来我还特意查阅了C99标准。 人家是这么用的 # define DET_START_SEC_VAR_INIT_UNSPECIFIED# include "MemMap.h" ...