宏定义,#define,宏定义可以用\做行连接,#用来产生字符串,##用来拼接,宏定义的时候要注意加()避免操作符优先级干扰,可以用do while(0)来把定义作为单独语句,#undef是define的反操作。 #if #ifdef #ifndef #else #elif #endif用来条件编译,为了避免头文件重复包含,经常用#ifndef #define #endif。 #include用来...
voidmemcopy(void*dst,void*src,size_tnbytes){size_t*mcdst=(size_t*)dst;size_t*mcsrc=(size_t*)src;size_tmctmp=(nbytes)/sizeof(size_t),mcn;if(mctmp<8){mcn=0;}else{mcn=(mctmp-1)/8;mctmp%=8;}switch(mctmp){case0:for(;;){*mcdst++=*mcsrc++;case7:*mcdst++=*mcsrc++;case6...
1//添加一个新的 key和value2rc = ini.SetValue("section1","name","张三");3if(rc <0) {4printf("添加name失败!\n");5return-1;6}7//const char *name = ini.GetValue("section1", "name", "");8//printf("name = %s\n", name);910ini.SetValue("section1","age","24");11ini...
C语言一种提供了9种流程控制语句,它们大致可以分为以下几类: 选择结构控制语句:if…else和switch 循环结构控制语句:for、while和do…while 结束本次循环语句:continue 终止循环和多分支语句:break 无条件转移语句:goto 函数返回语句:return 3. 复合语句 C语言允许将一条或多条语句用花括号{}括起来形成复合语句,也...
OpenJDK源码研究笔记(十一):浅析Javac编译过程中的抽象语法树(IfElse,While,Switch等语句的抽象和封装)...,浅析OpenJDK源码编译器Javac的语法树包com.sun.source.tree。抽象语法树,是编译
Kitsch 70s larks are averted thanks to the determination of directors Epstein and Friedman (who made thefilm) to tell the story of porn starin all its grimness and complexity. Seyfried is the victimised performer, who later claimed her appearance in the 1972 phenomenon Deep Throat amounted to fi...
}elseif(request == INT32) { DO_MAIN(int32_t); } } 简单宏定义 - 方式二 这种方式直接利用宏定义实现几个同类函数的定义,详见代码: simple_macro_2.c #defineDECLARE_FUNC(n) \ static void func_##n(int##n##_t *p, int len, float k) \ ...
学C语言入门，其实没你想的那么复杂。我就读于一个二本大学，以前也是C语言小白，但通过自学《C语言项目...
//不能创建临时变量计数器 int my_strlen(const char * str) { assert(str); if(*str == '\0') return 0; else return 1+my_strlen(str+1); } 代码语言:javascript 复制 //指针-指针的方式 int my_strlen(char *s) { assert(str); char *p = s; while(*p !=‘\0’ ) p++; return p...
defaultdodoubleelseenumextern floatforgotoifinlineintlong registerrestrictreturnshortsigned sizeofstaticstructswitchtypedefunion unsignedvoidvolatilewhile_Alignas _Alignof_Atomic_Bool_Complex_Generic _Imaginary_Noreturn_Static_assert ...