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Exercise 1.3 - Temperature Convertor
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Question
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Modify the temperature conversion program to print a heading above the table.

Solution
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.. literalinclude:: cprogs/ex_1.3_fahr2celheading.c
   :language: c

Explanation
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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 output.