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TCPPStopWatch

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Stop Watch Program

This program illustrates the use of the time.h header file. Not all features of the time.h header file are mentioned; only features that are relevant to this program are covered.

Important Points

• clock() - This function returns the processor time elapsed. Returns a value of type clock_t
• clock_t - Data type returned by clock function. Value of clock_t are in units of clock ticks
• CLK_TCK - Constant holding the time for one clock tick. (calibrated in seconds)

Code

Lines of focus are highlighted in red.

//stopwa.cpp
//built in Turbo C++ IDE (v3.0 Borland Corp 1992)
//author: deostroll
//created: Oct 12, 2005
//version: 1.0
/*	Program that illustrutates the concept of creating a stop watch		*/
include <time.h>   //to include time function

	   	    //clock() and the data type clock_t
include <stdio.h>

include <conio.h>  //for getch() and kbhit()

include <math.h>   //for floor()


//function to return value of key pressed
int keypress()
{
	char ch;
	if(kbhit())
	{
		ch=getch();
		return ch;
	}
	else//if nothing pressed
		return 0;
}

int main()
{
	clrscr();
	printf("Press enter to start");
	char ch='l';//dummy initialization
	double min, hour, sec,msec,time;
	//wait for user to hit enter key
	while(ch!=13)
	{
		ch=getch();
	}
	ch=12;//dummy initialization
	clock_t start,end;// created two variables of clock_t data type
	start=clock();//to store initial instance of time for reference
	_setcursortype(_NOCURSOR);//hiding the cursour
	while(ch!=13)
	{
		end=clock();//getting clock ticks at this point
		time=(end-start)/CLK_TCK;//total time in seconds
		//reducing the time sequentially to milliseconds
		hour=floor(time/3600);
		time-=hour*3600;
		min=floor(time/60);
		time-=min*60;
		sec=floor(time);
		time-=sec;
		msec=floor(time*1000);
		//displaying the time in respective format
		gotoxy(10,10);
		printf("% .0f : % .0f : %2.0f : %   .1f",hour,min,sec,msec);
		ch=keypress();//Check of key was pressed
	}
	gotoxy(10,20);
	printf("Stop Watch Ended");
	getch();
}

Output
Run the program to view output

Comments

• This code is also C compatible

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