Simple digital clock program in C

Simple-C-Program

In this article, we are going to learn how to design a digital clock in C language. In this example, we will learn how to design a digital clock, that keeps running on the screen and keep incrementing the time every second.

C Program to design a digital clock

It will start with 00:00:00 and then start incrementing the seconds, once the seconds reach 60, it will increment the minute. Once a minute reaches 60 it will increment the hours.

  • Once hours reach to 24 then it will reset the clock back to 00:00:00.
  • To perform the logic, we are using a infinite while loop, inside this loop we have the logic to count the seconds, mins and hours.We reset each values once they reach the threshold.
  • We are using sleep() function to give a delay of 1 seconds which acts as a clock tick of 1 seconds.
#include <stdio.h>
#include <time.h> //for sleep() function
#include <unistd.h>
#include <stdlib.h>


int main()
{
	int Hour, Min, Sec;
	Hour = 0;
	Min  = 0; 
	Sec  = 0;
	
	while(1)
	{
		system("clear");
		
		printf("Clock: %02d : %02d : %02d ",Hour,Min,Sec);
		
		fflush(stdout);
		
		Sec++;
		
		if(Sec==60)
		{
			Min+=1;
			Sec=0;
		}
		if(Min==60)
		{
			Hour+=1;
			Min=0;
		}
		if(Hour==24)
		{
			Hour=0;
			Min=0;
			Sec=0;
		}
		sleep(1);   
	}
return 0;
}

Output

Clock: 00 : 00 : 05

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