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Section 1.2 Variables and Arithmetic Expressions
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Question
========

This program uses the formula `C=(5/9)(F-32)` to print the Fahrenheit
temperatures and  their centigrade or Celsius equivalents.


Program
=======

.. literalinclude:: cprogs/sec_1.2_fahr2cel.c
   :language: c


Explanation
===========

In this program we are going to convert a given Fahrenheit temperature to
Celsius temperature using the formula C=(5/9)(F-32) To do this we declare some
variables in the beginning of the program so that they can be used in the later
stages of the program. The variables in this program are: lower,upper,step,
celsius,fahr.


The variable lower is assigned the value 0 similarly upper to 300, step to 20,
and fahr to lower. So when the program enters the while loop it checks whether
fahr <= upper is true if it is true then it assigns the variable celsius 5 *
(fahr - 32) / 9 and then it prints out put.