assigning values to variables usin cin in c++

is not working for me in case i press ctrl_z.
Having filled a text data file inside a do while, i press ctrl_z to end the process.
Than i try to assign value to a variable using cin but i cant because of the ctrl_z i had pressed before.
Is there a way to clean the data extraction from the "end of file" ?

Can you paste the code?
Question is not clear. Why do you want to press Ctrl-Z.This combination will break a runing process.

you shouldnt be using Ctrl-Z to end the Do while. you should have something going up (such as x++) which should cause it to end.

i think thats what your going on about...

very unclearly.
The reason i used ctrl_z is i was inserting data into a text file from within a do while loop.
There is no other way to stop it but using the ctrl_z key combination.
What i needed to do than was cin.clear() to enable the cin to continue working for me.
I'm sorry for displaying my problem in an unordered way.
And thanks a lot !

pssheba: I got what you are trying to say. I am paraphrasing in my on words. Correct me if I'm wrong:

You are using a Do-while loop to ask a user for imputs. Then at arbitrary time, you wish your program to stop taking input from the end user. For this you are taking help of Crtl-Z combination. Is this true?

In such case , you can ask question from user,whether he is interested in supplying inputs or not?
In case of yes, person cin operation, else , use " exit(1); " statement to shut down the program or "break;" for coming out of the loop but continue with execution process.

Probably, the input taken by "cin" statement is being redirected to a file. That is,
cin>>variable;
cout>> variable >> file;