How to write in C++?

Given that email addresses are in the following format:

firstName.lastName@yahoo.com

(a) Write a function

getEmailAddress

that prompts a user to enter an e-mail ad-

dress and returns it.

(b) Write a function

extract

that takes as its parameter an e-mail address and extracts

from it the firstname and lastname.

(c) Write a function

capitalize

that takes as its parameters a string and capitalizes

its first letter.

(d) Write a function

display

that displays the name in the following format:

lastName, firstName

(e) Write a program that repeatedly prompts the user to enter

an e-mail address. The

program should then extract from it the first and last names an

d output them in the

previous format. For example,

Enter an e-mail address -- steve.kerr@yahoo.com

Kerr, Steve

Try again (Y/N) -- Y

Enter an e-mail address -- mike.brown@yahoo.com

Brown, Mike

Try again (Y/N) -- N