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Exercise 1.17 - Print lines that are longer than 80 chars
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Question
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Write a program to print all input lines that are longer than 80 characters.

Solution
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.. literalinclude:: cprogs/ex_1.17_lengt80.c
   :language: c

Explanation
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A string in C is a character array which ends in ``\0``. getline is a function in
our program, which reads one character at a time using getchar and stores it in
a character array called s[] and it returns the length of the array.

When an array is sent as argument to the function, like ``line[MAXLINE]`` is sent
to ``getline`` function, the value is passed by reference, which means that any
changes the function makes will be available to the main program.

``getline`` returns the length of the line and in our main program, if the length
is greater than 80 characters we print it.