zellers congrunence

[bratiskovci]

1. How do I keep prompting the user for more dates until the user has indicated that he/she wishes to quit.
2. Computation of the day of the week MUST be moved to its own function.
3. How do I verify that the date entered is valid. For example, April only has 30 days so the user will not be allowed to enter April 31 as a valid date. See input section below to see how this is to be accomplished.
4. I have 2 functions which will help me ensure that the user enters a valid date. How do I integrate these functions into your solution.

# dictionary of day names for output.
dayNames = {0:"Saturday", 1:"Sunday", 2:"Monday", 3:"Tuesday", 4:"Wednesday" ,
5:"Thursday", 6:"Friday"}

# Get user input: month, day, year
sys.stdout.writ e("Please enter the day of the month (1-31): ")
dayOfMonth = int(sys.stdin.r eadline().strip ())

sys.stdout.writ e("Please enter the month (1-12): ")
month = int(sys.stdin.r eadline().strip ())

sys.stdout.writ e("Please enter the year: ")
year = int(sys.stdin.r eadline().strip ())

# Make adjustments for forumla
if month == 1 or month == 2:
month = month + 12
year = year - 1

# Compute coefficients
century = year/100
yearInCentury = year % 100

# Compute the day using Zeller's congruence
dayOfWeek = (dayOfMonth + ((month + 1)* 26)/10 + yearInCentury +
(yearInCentury/4) + (century/4) - 2*century) % 7

# Output answer
print "Day of week is %s" % dayNames[dayOfWeek]

[bartonc]

Please post back using [ code ] [ /code ] (but without spaces) tags around your code. Otherwise, we can't see the structure of you code. Thanks.

for example

 
# this is code
 

[bratiskovci]

here is the code...

# dictionary of day names for output.
dayNames = {0:"Saturday", 1:"Sunday", 2:"Monday", 3:"Tuesday", 4:"Wednesday" ,
5:"Thursday", 6:"Friday"}

# Get user input: month, day, year
sys.stdout.writ e("Please enter the day of the month (1-31): ")
dayOfMonth = int(sys.stdin.r eadline().strip ())

sys.stdout.writ e("Please enter the month (1-12): ")
month = int(sys.stdin.r eadline().strip ())

sys.stdout.writ e("Please enter the year: ")
year = int(sys.stdin.r eadline().strip ())

# Make adjustments for forumla
if month == 1 or month == 2:
month = month + 12
year = year - 1

# Compute coefficients
century = year/100
yearInCentury = year % 100

# Compute the day using Zeller's congruence
dayOfWeek = (dayOfMonth + ((month + 1)* 26)/10 + yearInCentury +
(yearInCentury/4) + (century/4) - 2*century) % 7

# Output answer
print "Day of week is %s" % dayNames[dayOfWeek]

[bartonc]

I'll work on the date thing. I want you to do the loop based on your other post, OK?

[bartonc]

Here's some date stuff for you to play with. Also look at the datetime module in the standard library.

import calendar
year = 2006
month = 10
day = 31
calendar.setfirstweekday(calendar.SUNDAY)
fd, nDays = calendar.monthrange(year, month)
if day > nDays:
    print "not a valid date"
 

Please use [code] tags when you post back. Thanks,
Barton

[bratiskovci]

 Input: the user inputs the amount in one of the following forms:
#         C value
#         F value
#         CM value
#         I value
#
# C - is a celcius value.  Program converts to fahrenheit
# F - is a fahrenheit value.  Program converts to celcius
# CM - is a centimetre value.  Program converts to inches
# I - is an inch value.  Program converts to centimetres
 
import sys
 
# Prompt user
sys.stdout.write( "Enter a value to convert: ")
 
# Read in a line from the keyboard
lineElements = sys.stdin.readline().split(" ")
 
# If the value is Celcius, convert to Fahrenheit
if lineElements[0].lower() == 'c':
    print "%s degress celcius is %.2f degrees fahrenheit." \
          % ( lineElements[1].strip(), (float(lineElements[1])*9.0/5.0)+32)
 
# If the value is Fahrenheit, convert to Celcius
elif lineElements[0].lower() == 'f':
    print "%s degress fahrenheit is %.2f degrees celcius." \
          % ( lineElements[1].strip(), (float(lineElements[1]) - 32) * 5.0/9.0)
 
# if the value is in centimetres, convert to inches
elif lineElements[0].lower() == 'cm':
    print "%s centimetres is %.2f inches." % ( lineElements[1].strip(),
                                             (float(lineElements[1]) * 0.3937))
 
# if the value is in inches, convert to centimetres
elif lineElements[0].lower() == 'i':
    print "%s inches is %.2f centimetres." % ( lineElements[1].strip(),
                                             (float(lineElements[1]) * 2.54))

[bratiskovci]

Sorry wrong code...this is the right code

import sys
 
# dictionary of day names for output.
dayNames = {0:"Saturday", 1:"Sunday", 2:"Monday", 3:"Tuesday", 4:"Wednesday",
 5:"Thursday", 6:"Friday"}
 
# Get user input:  month, day, year
sys.stdout.write("Please enter the day of the month (1-31): ")
dayOfMonth = int(sys.stdin.readline().strip())
 
sys.stdout.write("Please enter the month (1-12): ")
month = int(sys.stdin.readline().strip())
 
sys.stdout.write("Please enter the year: ")
year = int(sys.stdin.readline().strip())
 
# Make adjustments for forumla 
if month == 1 or month == 2:
    month = month + 12
    year = year - 1
 
# Compute coefficients
century = year/100
yearInCentury = year % 100
 
# Compute the day using Zeller's congruence
dayOfWeek = (dayOfMonth + ((month + 1)* 26)/10 + yearInCentury +
             (yearInCentury/4) + (century/4) - 2*century) % 7
 
# Output answer
print "Day of week is %s" % dayNames[dayOfWeek]

[bartonc]

Sorry wrong code...this is the right code

import sys
 
# dictionary of day names for output.
dayNames = {0:"Saturday", 1:"Sunday", 2:"Monday", 3:"Tuesday", 4:"Wednesday",
5:"Thursday", 6:"Friday"}
 
# Get user input: month, day, year
sys.stdout.write("Please enter the day of the month (1-31): ")
dayOfMonth = int(sys.stdin.readline().strip())
 
sys.stdout.write("Please enter the month (1-12): ")
month = int(sys.stdin.readline().strip())
 
sys.stdout.write("Please enter the year: ")
year = int(sys.stdin.readline().strip())
 
# Make adjustments for forumla 
if month == 1 or month == 2:
month = month + 12
year = year - 1
 
# Compute coefficients
century = year/100
yearInCentury = year % 100
 
# Compute the day using Zeller's congruence
dayOfWeek = (dayOfMonth + ((month + 1)* 26)/10 + yearInCentury +
(yearInCentury/4) + (century/4) - 2*century) % 7
 
# Output answer
print "Day of week is %s" % dayNames[dayOfWeek]

Awesome! You can post using tags! That's great.
Now you have some more things to work on after you copy the pieces from my last posts.
You CAN copy and paste to and from the forum, right?

[bratiskovci]

I am trying to incorporate this code into this program but I am have trouble getting to run properly. These functions are used for leap years...

def isLeap(year):
    if year % 400 == 0:
        return True
    elif year % 4 == 0 and year % 100 !=0:
        return True
    else:
        return False
 
def computeMaxDay(month, year):
    maxDays = {1:31, 2:28, 3:31, 4:30, 5:31, 6:30, 7:31, 8:31, 9:30, 10:31, 11:30, 12:31}
    if month == 2:
        if isLeap(year):
            return 29
    return maxDays[month]

[bartonc]

I am trying to incorporate this code into this program but I am have trouble getting to run properly. These functions are used for leap years...

def isLeap(year):
if year % 400 == 0:
return True
elif year % 4 == 0 and year % 100 !=0:
return True
else:
return False
 
def computeMaxDay(month, year):
maxDays = {1:31, 2:28, 3:31, 4:30, 5:31, 6:30, 7:31, 8:31, 9:30, 10:31, 11:30, 12:31}
if month == 2:
if isLeap(year):
return 29
return maxDays[month]

since

>>> 1996 %4
0
>>> 1997 %4
1
>>> 2000 %4
0
>>> not(2008 % 4)
True
>>>
You can simply

def IsLeapYear(year):
    return not (year % 4)