Silly little C code I wrote to record the time I spent doing past paper questions. Not technically sound or anything, but it works for me. :P

timer.c

/*
	Silly program to lap time and stuff, by Janith Leanage.
	Uses signal handling code. :P
*/

#include<stdio.h>
#include<signal.h>

int count[100];
int c = 0;
int maxtimes = 5;

/*
	Signal hanlder method
	Prints output in a neat format, and finally prints the
	total time elapsed
*/
void printoutput()
{
	signal(SIGINT, printoutput);
	
	int min = count[c]/60;
	int sec = count[c]%60;

	char *format = (sec < 10) ? "\n\t\t%2d:0%1d\t\t" : "\n\t\t%2d:%2d\t\t";

	printf(format, min, sec);

	c++;

	if(c >= maxtimes)
	{
		int i;
		for(i = 1; i < maxtimes; i++)
			count[0] += count[i];

		printf("\n\t\t-----\nTotal time:\t");
		format = ((count[0]%60) < 10) ? "%2d:0%1d" : "%2d:%2d";
		printf(format, (count[0]/60), (count[0]%60));
		printf("\n\t\t=====\n\n");
		exit(0);
	}
}

/*
	Main method
	Parses command line arguments and uses a primitive sleep
	system call to count the number of seconds elapsed
*/
main(int argc, char *argv[])
{
	int x;
	signal(SIGINT, printoutput);

	if(argc > 1)
	{
		maxtimes = atoi(argv[1]);
		if(maxtimes < 1 || maxtimes > 100)
		{
			maxtimes = 5;
			printf("The argument you passed was invalid. Please select a ");
			printf("number\nbetween 1 and 100. (Number has been set to 5 by default)\n\n");
		}
	}	
	else
		printf("You can pass the maximum amount of times (between 1 and 100)\n");
		printf("you need as a command line argument. (Now set to 5 by default)\n\n");

	for(x = 0; x < maxtimes; x++)
		count[x] = 0;
	
	while(1)
	{
		sleep(1);
		count[c]++;
	}
}