PLEASE help?

[gabber4227]

so here is the problem:

Write a C++ program that prompts the user to enter a first name, middle name, and last name, with each name separated by a space. Display the user's first name, middle name, and last name on the screen. On the other line, display only the user's initials. (Use a combination of the get and putback functions.)

please help me, i can't understand how to use putback function.

[gabber4227]

please help me. :(

[TightCoder]

Give us a code example of what you do understand.