how to do this? write a c++ program that given the name of a text file reads that file and counts the number occurrences of each alphabetic letter in the text. treat upper and lower case instances of a letter as the same letter. hint: look up tolower()---testing the case isn't necessary. if ch is a char, then ch-'a' is a valid c++ expression and will evaluate to 0 when ch is equal to 'a'---try 'b', 'c', and 'd'!)..
really need your help..this is for my case study.