$/*$

About this program:

$-$ This program counts words.

$-$ The specific words that will be counted are passed in as command$-$line

arguments.

$-$ The program reads words $($one word per line$)$ from standard input until EOF or

an input line starting with a dot $\text{'}.\text{'}$

$-$ The program prints out a summary of the number of times each word has

appeared.

$-$ Various command$-$line options alter the behavior of the program.

E$.$g$.,$ count the number of times 'cat', 'nap' or 'dog' appears.

$>./$main cat nap dog

Given input:

cat

$.$