How do you do 7 and 8?
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question
How do you do 7 and 8?
Transcribed Image Text:Hint: Play with some cases of using the modulus function % (introduced at the beginning of the
previous chapter). Specifically, explore what happens to x % 7 when x is negative.
6. Write a function days_in_month which takes the name of a month, and returns the number of
days in the month. Ignore leap years:
test(days_in_month("February"), 28)
test(days_in_month("December"), 31)
If the function is given invalid arguments, it should return None.
(7.)Write a function to_secs that converts hours, minutes and seconds to a total number of seconds.
Here are some tests that shoyld pass:
actual /Mat exPcct
test (to_secs ( 2, 30, 10), 9010)
test (to_secs ( 2, 0, 0), 7200)
test(to_secs (0, 2, 0), 120)
test(to_secs (0, 0, 42), 42)
test(to_secs ( 0, -10, 10), -590)
8.) Extend to_secs so that it can cope with real values as inputs. It should always return an integer
number of seconds (truncated towards zero):
test(to_secs (2.5, 0, 10.71), 9010)
test(to_secs (2.433,0,0), 8758)
9. Write three functions that are the "inverses" of to_secs:
1. hours_in returns the whole integer number of hours represented by a total number of
hours-incs): econds, lh= 3600sec (60*60=3600)
u: -u + ll
Expert Solution
Step 1 : Algorithm
1. Integer version
a. multiply hour by 3600
b. multiply minutes by 60
c. add hour minutes and second and return
2. Real value version
a. get second from minutes by subtracting integer part and multiplying with 60 and add to second
b. get integer part of minutes and add get minutes from hour by subtracting integer part and multiplying with 60 and add to minuts
c. take integer part of hour and apply integer version logic to get equivalent second.
d. return the sum
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