宏定义转字符串#a

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#include <string.h> #include <stdarg.h> #include <stdio.h> #include <limits.h> #include <stdio.h> #define CONFIG_DIR "/etc/usbs/"   struct macro {     const char *name;     unsigned int code; }; #define URB_FUNCTION_SELECT_CONFIGURATION            0x0000 #define URB_FUNCTION_SELECT_INTERFACE                0x0001 #define K_V(a) {#a, a}, #define K_V1(a) #a   int main() {       printf("%s",K_V1(URB_FUNCTION_SELECT_INTERFACE));              return 0; }

  输出： URB_FUNCTION_SELECT_INTERFACE