Hi there

I am a C++ person but trying to help a friend using Ruby.
He is supposed to ask for user input by using an index number to change
the letter of a word given, like say "dog".  So the user it asked to
enter the index number, lets say 0 is entered by the user, and he then
asks the user to put a new letter in (letter is a variable), then he
wants to change the index of 0 which is the "D" to a "C" (where c was
put in by the user).

Can anyone help with this?  How to do it please?

Cheryl
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