Assignment 21 – function implementation

Due Wednesday, March 27

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Module hodge.py

• The module defines two functions from the CS 1112 past.

• Program podge.py provides some simple testing of the functions.

Function sample( d )

• The function has a single decimal parameter d, which is a carbon-12 to carbon-14 decay ratio. The function returns an integer estimate of the age of a fossil with a such a ratio. The carbon-14 decay formula for estimating age is:

-8268.3982 * log( d )

Because the age is an estimate, it is always truncated to integer. For your information, the math.log() function should prove useful.

• The correct output of podge testing for the function is below.

sample( 0.35 ) = 8680

sample( 0.005 ) = 43808

sample( 1.0 ) = 0

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Function has_vowel( w )

• The function has a single string parameter w. The function returns the logical value True if w contains a lowercase vowel; that is one of 'a', 'e', 'i', 'o', or 'u'. If instead, w does not contain a lowercase vowel, the function returns the logical value False.

• The correct output of podge testing for the function is below.

has_vowel( oxen ) = True

has_vowel( urchin ) = True

has_vowel( mink ) = True

has_vowel( rabbit ) = True

has_vowel( lynx ) = False