scanf weird

yifei110

A very weird thing happened with scanf today, it didn't wait for input from the terminal and returned 0 directly; and started executing the next statement. Wang experts ask

superandy

Post code

orangedj

Is it like\n left in the input stream?

yifei110

printf ("Please Select Test:");
int result = scanf ("% d",&choice);

The reason is related to calling a function in a dynamic link library, but as for what is related, you can't see the original program of dll.

killerss

fgets until '\n'.

superandy

Use fflush (stdin); to clear the input buffer.

yifei110

fflush (stdin);

Plus this is OK, thanks!

orangedj

int result = scanf ("% * 1d% d",&choice); // Skip 1 character

orangedj

fflush (stdin); Obviously undefined behavior, why do so many people like to use nirvana?

jhl_2005

No empty buffer