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                #### 宏定義指令 #### 宏定義指令#define來定義一個宏如 #define MAX 100 MAX是宏名 100是宏體 宏替換或者宏展開 :用宏體替換宏名 #### #undef指令 #### 宏的作用域從定義開始到文件結束,假如想要提前終止宏,可以使用#undef指令 #include <stdio.h> #define A 'a' int main() { printf("%c\n",A); #undef A//使用#undef指令,結果下一行無法在使用A printf("%c\n",A); return 0; }
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