#在英语里面叫做 pound
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 ");
}
void help_command(){
printf("I am help command ");
}
struct command
{
char * name;
void (*function) (void);
};
#define COMMAND(NAME) {#NAME,NAME##_command}
#define PRINT(NAME) printf("token"#NAME"=%d ", token##NAME)
main(){
int token9=9;
PRINT(9);
struct command commands[] = {
COMMAND(quit),
COMMAND(help),
};
commands[0].function();
}
void quit_command(){
printf("I am quit command ");
}
void help_command(){
printf("I am help command ");
}
struct command
{
char * name;
void (*function) (void);
};
#define COMMAND(NAME) {#NAME,NAME##_command}
#define PRINT(NAME) printf("token"#NAME"=%d ", token##NAME)
main(){
int token9=9;
PRINT(9);
struct command commands[] = {
COMMAND(quit),
COMMAND(help),
};
commands[0].function();
}
得到的结果是：
token9=9
I am quit command