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Exercise 1.16 - Print length of arbitrary long input line
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Question
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Revise the main routine of the longest-line program so it will correctly print
the length of arbitrary long input lines, and as much as possible of the text.

Solution
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.. literalinclude:: cprogs/ex_1.16_longline.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.

We keep track of each line and it's length using a variable, `max`. If the
length of the line is greater than `max`, then we copy that line into the
`maxline` using a copy routine.

At the end of the program, whichever was the longest line that was copied in
maxline array, we just print that.