here's the description:
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You are asked to develop a C++ program that reads a text ¯le given by the user (e.g. test.txt), and output
the frequency of the prepositions contained in the text ¯le on the screen. Your program shall provide a simple
interface for the user to input the name of a text ¯le and exit the program.
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I don't expect you to write the code for me, but please tell me what ur ideas are. Thanx!!!

first, create an vector of all prepositions. (I don't know if that is a complete list, but it is a good start)

Then read the file one word at a time and search the vector created above for the word. If the word read from the file is found in the vector then do something with it.