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speller.c is one of the files that make up Problem Set 5, but it is already written by CS50 Staff and you may not alter it! Instead, you must implement your solution by altering three other component files: dictionary.c, dictionary.h, and Makefile.
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Please explain char* dictionary = (argc == 3) ? argv[1] : DICTIONARY; from speller.c
I am not sure if I understand what this piece of code in speller.c is trying to accomplish.
char* dictionary = (argc == 3) ? argv[1] : DICTIONARY;