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General Coding and Design =>
Calculator Programming
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bananaman
Indestructible
Calc Guru
Joined: 12 Sep 2005
Posts: 1124
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 Posted: 07 Nov 2006 07:51:43 pm Post subject: |
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| I need to know a good algorithm for determining what day of the week the first day of each month occurs. Does anyone know a good one for doing this? |
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JoeImp
Enlightened
Active Member
Joined: 24 May 2003
Posts: 747
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| Posted: 07 Nov 2006 11:42:32 pm Post subject: |
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http://www.mcs.csuhayward.edu/~malek/Mathlinks/Weekdays.html
Use the GetDay function below as needed.
Code:
#include <iostream>
#include <string>
#include <math.h>
using namespace std;
int GetDay(int day, string month, string year)
{
if (year.length() != 4)
{
cout << "Year is out of bounds";
return NULL;
}
int d = day;
int y = atoi(year.substr(2,2).c_str());
int c = atoi(year.substr(0,2).c_str());
int m = -1;
if (month == "March") { m = 1; }
if (month == "April") { m = 2; }
if (month == "May") { m = 3; }
if (month == "June") { m = 4; }
if (month == "July") { m = 5; }
if (month == "August") { m = 6; }
if (month == "September") { m = 7; }
if (month == "October") { m = 8; }
if (month == "November") { m = 9; }
if (month == "December") { m = 10; }
if (month == "January") { m = 11; y--; }
if (month == "February") { m = 12; y--; }
if (m == -1)
{
cout << "Invalid month";
return NULL;
}
return ((d + (int)(floor((2.6 * m) - .2)) - (2 * c) + y + (int)floor(y/4) + (int)floor(c/4))%7);
}
int main()
{
string DayOfWeek[] = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday",
"Friday", "Saturday" };
int day;
string month, year;
cout << "Enter day: ";
cin >> day;
cout << "Enter month: ";
cin >> month;
cout << "Enter year: ";
cin >> year;
if (int result = GetDay(day, month, year))
{
cout << "Day of the week: " << DayOfWeek[result];
}
return 0;
}
Sample Execution:
Code:
Enter day: 8
Enter month: November
Enter year: 2006
Day of the week: Wednesday
Last edited by Guest on 08 Nov 2006 12:45:11 am; edited 1 time in total |
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