I need help for this!

[Sumptiz]

how to create for example

enter your name: Charlie

and when press enter in the program see:

C
Ch
Cha
Char
Charl
Charli
Charlie

on another name.

[iGLbpfjN]

Why not start doing your code? If you get stuck in some section, feel free to ask about it.
Here is my tip: To do this code, read this http://www.cplusplus.com/doc/tutorial/arrays/ and this http://www.cplusplus.com/doc/tutorial/control/