1. 利用define来定义数值宏常量 #define宏定义是个演技非常高超的替身演员,但也会经常耍大牌的,所以我们用它要慎之又慎。它可以出现在代码的任何地方,从本行宏定义开始,以后的代码就都认识这个宏了;也可以把任何东西定义成宏。因为编译器会在预编译的时候用真身替换替身,而在我们的代码里面却又用常常用替身来帮忙。
#define MIN(x, y) ((x) < (y) ? (x) : (y)) #define SUM(x, y) ((x) + (y)) 当宏使用多个语句时,使用do-while(0)语句保护它 typedef struct { int32_t px, py; } point_t; point_t p; /* Define new point */ /* Wrong implementation */ /* Define macro to set point *...
当C语言工程很大,源码非常多时,如果还去使用GCC命令编译程序,几乎是不现实的。这时候,可以通过编写shell脚本去执行编译命令,当然这并不是一种好的方式。在Linux上我们可以写shell脚本,在Windows上则可以编写bat脚本 本篇以如下源码作为示例工程,需要编译一个main.exe程序出来 add.c 代码语言:javascript 代码运行次数:...
whether we need to define the preprocessor WIN32 IN 64 BIT CONFIGURATION Which header has declaration of ComPtr Which license does the c/c++ compiler of visual studio use? Which ws2_32.lib should I link? While trying to launch a process with credentials of the interactive user, GetTokenInform...
#include<windows.h>#include<stdlib.h>#include<string.h>#include<stdio.h>#include<conio.h>#include<process.h>#defineMAX_THREADS 32// The function getrandom returns a random number between// min and max, which must be in integer range.#definegetrandom( min, max ) (SHORT)((rand() % ...
#define FABRICATE_H int Fabricate( int m,int n ); int Multi( int m, int n ); #endif //main.cpp #include using namespace std; #include "Fabricate.h" int main() { int m ,n; cout << "input m and n:"; cin >> m >> n; cout << "Fabricate(" << m << "," << n...
#define FILE_NAME "./test1.ini" test1.ini内容如下: 1. 加载ini文件 1//定义ini文档对象2CSimpleIniA ini;34//加载ini文件5SI_Error rc;6rc = ini.LoadFile(FILE_NAME);//另一种方式:SI_Error LoadFile(FILE * a_fpFile);7if(rc <0) {8printf("加载 %s ini 文件失败!\n", FILE_NAME);...
To use lHint, define special hint values, typically a bitmask or an enumerated type, and have the document pass one of these values. To use pHint, derive a hint class from CObject and have the document pass a pointer to a hint object; when overriding OnUpdate, use the CObject::...
"相对于#define语句来说,它的优势在于常量值可以自动生成。尽管可以声明enum类型的变量,但编译器不检查这种类型的变量中存储的值是否为该枚举的有效值。不过,枚举变量提供这种检查,因此枚举比#define更具优势。此外,调试程序可以以符号形式打印出枚举变量的值"; (查看原文) Cennial 2 回复 2赞 2012-09-12 15:...
In the BEA Tuxedo system, a transaction is used to define a single logical unit of work that either wholly succeeds or has no effect whatsoever. A transaction allows work performed in many processes, possibly at different sites, to be treated as an atomic unit of work. The initiator of a...