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Exercise 1.15 - Temperature Convertor using function call
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Question
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Rewrite the temperature conversion program of Section 1.2 to use a function for
conversion.

Solution
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.. literalinclude:: cprogs/ex_1.15_tempconv.c
   :language: c

Explanation
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In this program we are going to convert a given Fahrenheit temperature to
Celsius or Celsius temperature to Fahrenheit temperature using the formula
C=(5/9)(F-32 ).  We retain most of the program from section 1.4.  In addition
This program contains functions such as fahrtocelsius and celsiustofhar. The
functions fahr_to_celsius and celsiustofhar are used to make the program more
dynamic by giving choices to the users for conversion between 1 - Fahrenheit to
Celsius Conversion 2 - Celsius to Fahrenheit Converion.