c语言 编写实时时钟

#include 
int getmonthofday(int year, int month){
    int day = 0;
    switch (month){
        case 1:
        case 3:
        case 5:
        case 7:
        case 8:
        case 10:
        case 12:
            day = 31;
            break;
        case 4:
        case 6:
        case 9:
        case 11:
            day = 30;
            break;
        case 2:
            if((year % 4 == 0) &&(year % 100 != 0) || (year % 400 == 0)){
                day = 29;
            }else{
                day = 28;
            }break;
    }
    return day;
}

int main(int argc, const char *argv[])
{
    int year,month,day,hour,min,sec;
    year = 2022;
    month = 12;
    day = 31;
    hour = 23;
    min = 59;
    sec = 56;
    while (1){
        sec++;
        if(sec>=60){
            sec = 0;
            min++;
            if(min>=60){
                min = 0;
                hour++;
                if(hour>=24){
                    hour = 0;
                    day++;
                    if(day>=getmonthofday(year,month)){
                        day = 1;
                        month++;
                        if(month>=12){
                            month=1;
                            year++;
                        }
                    }
                }
            }
            
        }
        printf("%d-%02d-%02d-%02d-%02d-%02dr",year,month,day,hour,min,sec);
        fflush(stdout);
        sleep(1);
    }
    return 0;
}

//我的 #include  中包含以下信息



#ifndef __HEAD_H__  //如果没有定义头文件 就定义头文件                     
#define __HEAD_H__  //如果定义了就跳过              作用防止头文件重复包含


#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#endif