so for the above how shall i program so that the value of "b" is taken by user. and wish to hear why fflush(stdin) is not flushing the keyboard bufferCode:main() { char a,b; printf("Enter a value\n"); scanf("%c", &a); // the value entered is X and so in buffer // its saves as X\n fflush(stdin); // this is not flushing keyboard buffer scanf("%c",&b); // b takes the value \n }
You cannot fflush stdin. This is covered in the FAQ.
EDIT: More information can be found here
Yes, i know that fflush is used for output stream, in that case i dont know what to do with the input stream....for exampl....when the user is asked to enter a character user enters "x" so in buffer the value is stored at "x\n"...where the value "x" is stored in variable "a" and during second scanf the value "\n" is stored in variable "b" instead of taking from the user
Well you read the FAQ, learn how marvellous fgets() is, and then forget about using scanf() ever again for trying to read input.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
I agree with u that fgets is very much better than scanf....but need to understand why scanf fails there and if at all we are in need to use scanf itself then how to solve the above problem
ok now the fflush(stdin) behaviour is undefined....then is there any method by which we are flush the input stream.
Yes, read the FAQ!
Quzah.
Hope is the first step on the road to disappointment.
the below was the solution given in FAQ.
"check your compiler's documentation to see if it has a (non-portable) method for flushing input. "
I'm using linux cc compiler to compile my c programs what shall i use to flush input stream
You use fgets() and the whole problem goes away.
Are you listening?
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
READ THE FAQ! clicky click!
Quzah.
Hope is the first step on the road to disappointment.
lol are you a teacher?Originally Posted by quzah
I'd pity the student who would have Quzah as a teacher.
Although at least they'd learn something.
All the buzzt!
CornedBee
"There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
- Flon's Law
