C :

#include<stdio.h>
struct Time
{
	int hour;
	int minute;
	int second;
};
void update(struct Time *pt)
{
	pt->second++;
	if(pt->second==60)
	{
		pt->second=0;pt->minute++; 
	}
	if(pt->minute==60)
	{
		pt->minute=0;
		pt->minute++;
	}
	if(pt->hour==24)
	{
		pt->hour=0;
	}
}
void display(struct Time *pt)
{
	printf("%d:%d:%d\n",pt->hour,pt->minute,pt->second);
}
void delay()
{
	int t;
	for(t=0;t<100000000;t++);
}
int main()
{
int i;
struct Time t1={0,0,0};
struct Time *p;
p=&t1;
for(i=0;i<5;i++)
{
	update(p);
	display(p);
	delay();
}
return 0;	
}