This program illustrates the count() member function for maps.
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First we put the first five pairs of capital letters and their ASCII codes
into a map. In this case the capital letters are the keys and the ASCII
codes are the values in the key/value pairs of the map. Then we count the
number of times a pair with a given key (a capital letter entered by the
user) appears in the map.
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Enter a capital letter: B
The number of times a component with key B appears in the map is 1.
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