Zeller's Algorithm Using C++
Zeller's congurence is an algorithm proposed by Christian Zeller which calculate the day of the weekfor a given year.
Zeller's congruence is an algorithm proposed by Christian Zeller which calculates the day of the week for a given year. The C++ program is used to find the day of the week for a given year, month, and date by a method known as the Zeller's Algorithm.
The algorithm uses the formula which is:
h = (d + (13 * (m + 1) / 5) + (y) + (y / 4) - (y / 100) + (y / 400)) mod 7
where,
1. 'h' is the day of the week (if h=1 then Sunday, if h=2 then Monday, and so on).
2. 'd' is the day of the month.
3. 'm' is a number corresponding to the month of the year.
4. 'y' is the year.
Submitted by Adarsh Kumar Jha (Adarsh)
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Comments
The code is erroneous. The expression
x % 7
cannot result in 7 so the last if branch should read
if(h == 0) ...
instead of
if(h == 7)...
otherwise Saturdays will never appear on output.