C program to design a digital clock

This program will generate a digital clock using c program.

Logic to design a digital clock

The logic behind to implement this program,

Initialize hour, minute, seconds with 0.
Run an infinite loop.
Increase second and check if it is equal to 60 then increase minute and reset second to 0.
Increase minute and check if it is equal to 60 then increase hour and reset minute to 0.
Increase hour and check if it is equal to 24 then reset hour to 0.

Implementation of Digital Clock in C

/*C program to design a digital clock.*/
 
#include <stdio.h>
#include <time.h> //for sleep() function
#include <unistd.h>
#include <stdlib.h>
 
int main()
{
    int hour, minute, second;
     
    hour=minute=second=0;
 
    while(1)
    {
        //clear output screen
        system("clear");
         
        //print time in HH : MM : SS format
        printf("%02d : %02d : %02d ",hour,minute,second);
         
         //clear output buffer in gcc
        fflush(stdout);
         
         //increase second
        second++;
 
        //update hour, minute and second
        if(second==60){
            minute+=1;
            second=0;
        }
        if(minute==60){
            hour+=1;
            minute=0;
        }
        if(hour==24){
            hour=0;
            minute=0;
            second=0;
        }
         
        sleep(1);   //wait till 1 second
    }
 
    return 0;
}