是a+b然后去和c,d相乘,但是因为使用了define(它只是一个简单的替换),所以式子实际上变成了 c*a + b*d 另外举一个例子: #define pin (int*); pin a,b; 本意是a和b都是int型指针,但是实际上变成int* a,b; a是int型指针,而b是int型变量。 这是应该使用typedef来代替define,这样a和b就都是int型指...
6、#elif如果前面的#if给定条件不为真,当前条件为真, 则编译下面代码 //usage1#ifdefMACRO1/*--CODE1--*/#elifMACRO2/*--CODE2--*/#endif//usage2#ifdefMACRO1/*--CODE1--*/#elifMACRO2/*--CODE2--*/#else/*--CODE3--*/#endif 7、#endif结束一个#if……#else条件编译块 下面的宏编译块常...
9、得到一个变量的地址(word宽度) #define B_PTR( var ) ( (byte *) (void *) &(var) ) #define W_PTR( var ) ( (word *) (void *) &(var) ) 10、得到一个字的高位和低位字节 #define WORD_LO(xxx) ((byte) ((word)(xxx) & 255)) #define WORD_HI(xxx) ((byte) ((word)(xxx)...
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w1, w2 - Word values b1 - b8 - Byte values Return value None Remarks This function is used as a convenience as many Windows API headers use a similar macro to define a GUID. See Also: COM usage Example usage DEF CLSID_DirectDraw as GUID DEFINE_GUID( CLSID_DirectDraw, 0xD7B70EE0,0x...
1、Definition:The #define DirectiveYou can use the #define directive to give a meaningful name to a constant in your program. The two forms of the syntax are: Syntax#define identifier token-stringopt#define identifier( identifieropt, . , identifieropt ) token-stringoptUsage:1. 简单的define...
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To originate and secure the permanent existence of; to found; to institute; to create and regulate; - said of a colony, a state, or other institutions. To secure public recognition in favor of; to prove and cause to be accepted as true; as, to establish a fact, usage, principle, opin...
This task is usually carried out by lexicographers, who analyze the various connotations and usage patterns of a word to create comprehensive definitions. By defining words, we minimize ambiguity and ensure everyone interprets the term consistently, aiding effective communication. 3. Defining ...
Usage: 1. 简单的define定义 #define MAXTIME 1000 一个简单的MAXTIME就定义好了,它代表1000,如果在程序里面写 if(i<MAXTIME){...} 编译器在处理这个代码之前会对MAXTIME进行处理替换为1000。 这样的定义看起来类似于普通的常量定义CONST,但也有着不同,因为define的定义更像是简单的文本替换,而不是作为一个...