编辑代码

#include <stdio.h>
#define TWO 2
#define PF printf("TWO is %d\n",TWO)
typedef enum
{
    Mon = 1,
    Tus,
    Wes,
    Thu,
    Fri,
    Sat,
    Sun,
} Workday;
int main () {
    Workday day;
    day = Wes;
    printf("Today is %d \n",day);
    //JSRUN引擎2.0，支持多达30种语言在线运行，全仿真在线交互输入输出。 
    printf("Hello world!     - c.jsrun.net.\n");
    PF;
    printf("%s-%s-%d \n",__func__,__TIME__,__LINE__);
    return 0;
}