理解 C++/C 預處理器
< 瞭解 C++
 |
此頁面或章節是一份未完成的草稿或提綱。 你可以幫助開展工作，或在專案室尋求幫助。 |
預處理器
#include <stdio.h> includes contents of stdio.h
#error text display text as compile time error
#warning text display text as compile time warning
#pragma compiler specific options
#define M define M
#undef M undefine M
#if (condition) conditional compiling
#ifdef M compiled if M is defined
#ifndef M compiled if M is not defined
#elif (condition) conditional compiling
#else conditional compiling
#endif end conditional section
defined() is macro defined.
!defined() is macro not defined
M ## D combines M and D into MD
#M treat M as string "M"