C语言宏定义时#(井号)和##(双井号)的用法1

在C语言的宏定义中，一个#表示字符串化；两个#代表concatenate

举例如下：

#include <iostream>
void quit_command(){
    printf("I am quit command\n");
}   
void help_command(){
    printf("I am help command\n");
}   
struct command
{
    char * name;
    void (*function) (void);
};  
#define COMMAND(NAME) {#NAME,NAME##_command}
#define PRINT(NAME) printf("token"#NAME"=%d\n", token##NAME)
main(){
    int token9=9;
    PRINT(9);
    struct command commands[] = {
        COMMAND(quit),
        COMMAND(help),
    };  
    commands[0].function();
}

• 转：https://www.cnblogs.com/wicub/p/6030666.html