Assuming that a text fi le contains characters in the ASCII range 0 to 127 and contains at least
one newline character, create a function that uses the fi lename as argument to return 1 if the
fi le contains only text, or -1 otherwise.
Write a program that compares two fi les whose names are provided as user input. The program
must quit with a suitable message that indicates the location in the fi le where the fi rst mismatch
was encountered.
