Need help with Looping file.

[wakamoe]

So I want to loop a file so that the user can log in. For example i got this .txt file:

asd fgh
zxc vbn
qwe rty
tyu iop

where the first word is the user name and the second the password. I want to ask the user to type in their name and password and then the program will scan the .txt file to find if the user is able to login.

I also would like to know how to use tolower. in this case I want to tolower the username. how should i go about doing that.

[roger911]

Google is your friend.

to lower (tolower) :
http://www.cplusplus.com/reference/cctype/tolower/

Loops :
http://www.cplusplus.com/doc/tutorial/control/

File streams :
http://www.cplusplus.com/doc/tutorial/files/

[wakamoe]

I'm not too sure how to do it, this is my current program. Its a Sign up and log in type of program where I'll be adding switch if the user login successfully.

I actually did google but I do not know how to apply it to my program

https://gist.github.com/anonymous/2514efea38a305d0ea66