#define <宏名> <字符串> 例： #define PI 3.1415926 #define <宏名> (<参数表>) <宏体> 例： #define A(x) x 例1 #define N 2+2 printf(“%d”,a); #define N (2+2) /*这样就可替换成(2+2)*(2+2)=16*/ #define area(x) x*x /*这在使用中是很容易出现问题的，看如下的程序*/ int y = area(2+2); printf(“%d”,y); #include <iostream.h> #define product(x) x*x j = product(i++); cout<<"j="<<j<<endl; cout<<"i="<<i<<endl; k = product(++i); cout<<"k="<<k<<endl; cout<<"i="<<i<<endl; #define Conn(x,y) x##y #define ToChar(x) #@x #define ToString(x) #x int n = Conn(123,456); /* 结果就是n=123456;*/

char* str = Conn("asdf", "adf"); /*结果就是 str = "asdfadf";*/ #ifndef BODYDEF_H #define BODYDEF_H #define MEM_B( x ) ( *( (byte *) (x) ) ) #define MEM_W( x ) ( *( (word *) (x) ) ) #include <iostream> #include <windows.h> #define MEM_B(x) (*((byte*)(x))) #define MEM_W(x) (*((WORD*)(x))) int bTest = 0x123456; byte m = MEM_B((&bTest));/*m=0x56*/ int n = MEM_W((&bTest));/*n=0x3456*/ #define OFFSETOF ( type, field ) ( (size_t) &(( type *) 0)-> field ) #define FSIZ( type, field ) sizeof( ((type *) 0)->field ) #define B_PTR( var ) ( (byte *) (void *) &(var) ) #define W_PTR( var ) ( (word *) (void *) &(var) ) #define UPCASE( c ) ( ((c) >= ''a'' && (c) <= ''z'') ? ((c) - 0x20) : (c) ) #define DECCHK( c ) ((c) >= ''0'' && (c) <= ''9'') #define HEXCHK( c ) ( ((c) >= ''0'' && (c) <= ''9'') ||((c) >= ''A'' && (c) <= ''F'') ||((c) >= ''a'' && (c) <= ''f'') ) #define INC_SAT( val ) (val = ((val)+1 > (val)) ? (val)+1 : (val)) #define ARR_SIZE( a ) ( sizeof( (a) ) / sizeof( (a[0]) ) ) _LINE_ /*(两个下划线)，对应%d*/ _FILE_ /*对应%s*/ _DATE_ /*对应%s*/ _TIME_ /*对应%s*/