NANYOSTAR

*****comment***** /**/这种习惯的注释不能嵌套。 编译器会将注释部分剔除，但不是简单的删除，而是用空格代替原来的注释，比如int/*...*/i是合法的，但in/*...*/t i不合法。 y = x/*p编译出错，编译器把/*当成一段注释的开始。y = x/ *p或y = x/(*p)正确。 *****back slash***

*******数组首元素的地址 vs 数组首地址******* /* a: bff0660c a+1: bff06610 &a: bff0660c &a+1: bff06620 */ int a[5] = {1,2,3,4,5}; printf("a: %x\n", a); //address of first element in the array printf("a+1

ANSI C预处理命令： #define, #undef, #include, #if, #else, #elif, #endif, #ifdef, #ifndef, #line, #error, #pragma ANSI C宏： _LINE_：表示正在编译的文件的行号 _FILE_：表示在横在编译的文件的名字 _DATE_：表示编译时刻的日期字符串，例如“25 De

C语言32个关键字：auto, int, double, long, char, float, short, signed, unsigned, struct, union, enum, static, switch, case, default, break, register, const, volatile, typedef, extern, return, void, continue,

//little endian: the least significant byte at lowest address. //big-endian: the most significant byte at lowest address. int checkSystem() { //union size is the largest size of its fields. And all