Program tells you the day of the date inputed

Program tells you the day of the date inputed. Remember when you copy the code paste in a file named *.c and not cpp file as that will cause an error. I have commented in the code where it will cause the error.

Code:

#include<stdio.h>
#include<conio.h>
#include<time.h>

#define AND &&
#define OR ||
#define RD 1900  /*Reference date 1900 jan 1st monday*/


const int month[12]={31,28,31,30,31,30,31,31,30,31,30,31};

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ 
/* * *  Program tells you the day of the date inputed  * * */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ 

void EnterDate(int *dt)
{
	do
	{
		if(*dt == 0)
			printf("\nENTER YOUR DATE OF BIRTH\n");
		printf("\nENTER DATE\n");
		scanf("%d",dt);
		if((*dt) <= 0 OR (*dt) > 31)
		{
			printf("\nSORRY NO ILLEGAL ENTRIES PLEASE\n");
			printf("\nDATE OF ANY MONTH CANNOT EXCEED 31 OR GO BEYOND 0\n");
			printf("\nENTER AGAIN\n");
		}
		else
		{
			break;
		}
	}while (1);
}

void EnterMonth(int *dt, int *m)
{
	do
	{
		printf("\nENTER MONTH \n");
		scanf("%d",m);
		if(*m <= 0 OR *m > 12)
		{
			printf("\nTHERE ARE TWELVE MONTH'S IN AN YEAR\n");
			printf("\nENTER AGAIN\n");
			continue;
		}
		if((*dt) > month[*m-1] AND *m != 2)
		{ 
			printf("\nTHIS MONTH DOES NOT HAVE THIS DATE \n");
			printf("\nENTER AGAIN\n");
			continue;
		}
		if(*dt == 30 AND *m == 2)
		{
			printf("FEBRUARY HAS A MAXIMUM OF 29 DAYS");
			printf("\nENTER AGAIN\n");
			EnterDate(dt);
			continue;
		}
		break;
	}while(1);
}

void EnterYear(int *dt, int *m, int *yr)
{
	do
	{
		printf("\nENTER YEAR \n");
		scanf("%d",yr);
		if(*yr<1900)
		{
			printf("\nI DON'T THINK YOU ARE THIS OLD\n");
			printf("\nENTER AGAIN\n");
			continue;
		}
		if(*m==2 AND *dt==29)
		{
			if((*yr%4==0)AND((*yr%100!=0)OR(*yr%400==0)))
				printf("\nYOU ARE LUCKY TO HAVE SUCH A UNIQUE BIRTH DATE\n");
			else
			{
				printf("\nFEBRUARY IN THE YEAR %d HAS 28 DAYS\n",*yr);
				printf("\nENTER AGAIN\n");
				continue;
			}
		}
		break;
	}while(1);
}

int main()
{
	int m = 0,dt = 0,yr = 0,i = 0;
	unsigned int ydays,days,leap=0,mdays=0,ddays;
	char ch;
	EnterDate(&dt);
	EnterMonth(&dt,&m);
	EnterYear(&dt,&m,&yr);

	for(i=RD;i<yr;i++)
	{
		if((i%4==0)AND((i%100!=0)OR(i%400==0)))
			leap++;
	}
	for(i=0;i<(m-1)AND(i<11);i++)
		mdays=mdays+month[i];
	if(m>2  AND (yr%4==0) AND ((yr%100!=0)OR(yr%400==0)))
		mdays++;
	ydays=(yr-RD)*365;
	ddays=dt-1;
	days=ydays+leap+mdays+ddays;
	switch (days%7)
	{
	case 0:
		printf("\nYOU WERE BORN ON MONDAY\n");
		break;
	case 1:
		printf("\nYOU WERE BORN ON TUESDAY\n");
		break;
	case 2:
		printf("\nYOU WERE BORN ON WEDNESDAY\n");
		break;
	case 3:
		printf("\nYOU WERE BORN ON THURSDAY\n");
		break;
	case 4:
		printf("\nYOU WERE BORN ON FRIDAY\n");
		break;
	case 5:
		printf("\nYOU WERE BORN ON SATURDAY\n");
		break;
	case 6:
		printf("\nYOU WERE BORN ON SUNDAY\n");
		break;
	}
	printf("\nDO YOU WISH TO CONTINUE[Y/N]\n");
	fflush(stdin);
	scanf("%c",&ch);
	if(ch=='Y' OR ch=='y')
	{
		// This is possible in C but with .cpp as file name you will have errors
		main();
	}
	return 0;
}

 

[thread=4074]Month calender in plain C[/thread] tells you the complete month details and display it as in any standard calender.