DigitalClock.c

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<unistd.h>

void fill_date(char* buffer);
void fill_time(char* buffer, int format);
int input_format();
void clear_screen();

int main() 
{
    char time[50], date[50];
    int format = input_format();

    while (1)
    {
        fill_time(time, format);
        fill_date(date);
        clear_screen();
        printf("Date: %s\n", date);
        printf("Time: %s\n", time);
        sleep(1);
    }
    return 0;
}

void fill_date(char* buffer)
{
    time_t raw_time;
    struct tm *current_time;

    time(&raw_time);
    current_time = localtime(&raw_time);
    strftime(buffer, 50, "%A %B %d %Y", current_time);
}

void fill_time(char* buffer, int format)
{
    time_t raw_time;
    struct tm *current_time;

    time(&raw_time);
    current_time = localtime(&raw_time);
    if (format == 1)
    {
        strftime(buffer, 50, "%H:%M:%S", current_time);
    }
    else
    {
        strftime(buffer, 50, "%I:%M:%S %p", current_time);
    }
}

int input_format()
{
    int format;
    printf("\nChoose the time format: ");
    printf("\n1. 24 Hour fomrat");
    printf("\n2. 12 Hour format");
    printf("\nMake a choice(1/2): ");
    scanf("%d", &format);
    return format;
}

void clear_screen()
{
    #ifdef _WIN32
        system("cls");
    #else
        system("clear");
    #endif
}