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Chapter 5 - Born on which day of the week.
© 1998 by Bobby Griggs.

// Program name:  Birthday



// Purpose:  To compute the day of the week an individual was born



// on by entering his or her birth date.







// Win32 console application







#include < iostream.h >



#include < stdio.h >







void Input_birth_date(int &mm,int &dd,int &yy);



int Compute_total(int mm,int dd,int yy);



void Display_day(int t,int yy);







void main()



{



	int month,day,year,total;







	Input_birth_date(month,day,year);



	total = Compute_total(month,day,year);







	Display_day(total,year);



	return;



}







void Input_birth_date(int &mm,int &dd,int &yy)



{



	cout << "Enter individual's birth date" << endl << endl; cout << "Month (MM): "; cin>> mm;



	cout << "Day (DD): "; cin>> dd;



	cout << "Year (YYYY): "; cin>> yy;



	cout << endl; return; } int Compute_total(int mm,int dd,int yy) { int t,r; t="0;" if (yy> 1900)



	{



		yy = yy - 1900;



		t = yy / 4;



		t = t + yy;



		t = t + dd;



		switch (mm)



		{  // begin switch statement



		case 1 :



			t = t + 1;



			break;



		case 2 :



		case 3 :



			t = t + 4;



			break;



		case 4 :



			break;



		case 5 :



			t = t + 2;



			break;



		case 6 :



			t = t + 5;



			break;



		case 7 :



			break;



		case 8 :



			t = t + 3;



			break;



		case 9 :



			t = t + 6;



			break;



		case 10 :



			t = t + 1;



			break;



		case 11 :



			t = t + 4;



			break;



		case 12 :



			t = t + 6;



		}  // end switch statement



		if ((yy % 4) == 0)



			if ((mm == 1) || (mm == 2))



				t--;



	}



	else



		yy = -1;



	return t;



}







void Display_day(int t,int yy)



{



	int rem;



	



	if (yy == -1)



		cout << "The birth year was prior to 1900." << endl << endl; else { cout << "You were born on "; rem="t" % 7; switch (rem) { case 1 : cout << "Sunday!"; break; case 2 : cout << "Monday!"; break; case 3 : cout << "Tuesday!"; break; case 4 : cout << "Wednesday!"; break; case 5 : cout << "Thursday!"; break; case 6 : cout << "Friday!"; break; case 0 : cout << "Saturday!"; } cout << endl << endl; } cout << "Hit enter to continue ... " << endl; getchar(); return; }