Write a program which stores information about the date in a structure containing three members - day, month and year. Using bit fields the day number should get stored in first 5 bit of day, the month number in 4 bits, of month and year in 12 bits of the year. Write a program to read the date of joining of 10 employees and display them in ascending order of the year.

#include<stdio.h>
#include<conio.h>
#include<stdarg.h>
#include<Windows.h>

#define MAX 5

typedef struct date
{
	unsigned d : 5;
	unsigned m : 4;
	unsigned y : 12;
}EMP;

void swap(EMP*, EMP*);

int main()
{

	int i, j;
	EMP e[10], a[10];
	e[0].y = 2010; e[0].m = 12; e[0].d = 10;
	e[1].y = 1990; e[1].m = 3; e[1].d = 23;
	e[2].y = 1995; e[2].m = 4; e[2].d = 13;
	e[3].y = 2001; e[3].m = 1; e[3].d = 13;
	e[4].y = 1990; e[4].m = 3; e[4].d = 20;
	e[5].y = 1992; e[5].m = 6; e[5].d = 19;

	for (i = 0; i < MAX; i++)
		a[i] = e[i];

	for (i = 0; i < MAX; i++)
	{
		for (j = i + 1; j < MAX; j++)
		{
			if (a[j].y < a[i].y)
				swap(&a[i], &a[j]);
			if (a[j].y == a[i].y)
			{
				if (a[j].m < a[i].m)
					swap(&a[i], &a[j]);
				if (a[j].m == a[i].m)
					if (a[j].d < a[i].d)
						swap(&a[i], &a[j]);
			}
		}
	}

	system("cls");
	for (i = 0; i <= 4; i++)
	{
		printf("\nEmplyee no. %d : ", i + 1);
		printf("%2d/%2d/%4d", a[i].d, a[i].m, a[i].y);
	}
	_getch();
	return 0;
}
void swap(EMP *a, EMP *b)
{
	EMP c;
	c = *a;
	*a = *b;
	*b = c;
}