Program #3 (use c++ to answer the follwoing question)

A frequency table lists words and the number of times each word appears in a text file. Write a program that creates a frequency table for a file whose name is entered by the user. You can use a map of string-int pairs. You may want to use the C library function ispunct() (in header file CTYPE.H) to check for punctuation so you can strip it off the end of a word, using the string member function substr(). Also, the tolower() function may prove handy for uncapitalizing words.