in c++ 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.

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Header files

A file with an extension that has some predefined declarations and definitions is called a header file. Every computer program imports a set of header files to perform common tasks such as getting input, displaying output, and so forth. Every language has different header files (such as C, JAVA, Python, and C++). In this article, header files are explained mainly in the context of the C/C++ language.