[C Language] clears the cache.

Clear the cache in stdin

Int C;

While (C = getchar ())! = EOF & C! = '\ N ');

The cache is cleared, but '\ n' (10) is left behind)

When reading, you can use scanf ("% [^ \ n]", c); To empty \ n.

Or scanf ("\ n % d", C );

 

 

Failed solution:

1,

While (! Feof (stdin )){

Getchar ();

}

Result:ProgramIt will be stuck in this section and will never generate a while loop.

Because the feof (File * file) function must wait until the data cannot be read for the next time, non-0 is returned. For example, when reading an empty file, the returned value of feof (File) is 0, use

After the fread () function, although nothing is read, feof (File) returns non-0;

Therefore, although the end is reached, the returned value of feof (stdin) is still 0, and the program will be stuck in getchar (), waiting for input.

 

2,

Fflush (stdin );

Invalid after use. Check that this function is not a standard function and can be used by VC compiler, but other compilers such as GCC do not support it (Note: fflush (stdout) is a standard function)

 

3,

While (C = getchar ())! = EOF & C! = '\ N'); the first character in the buffer zone is' \ n '.

Scanf ("% * [\ n] % d", c); at this time, c reads \ n, but does not read the following input, resulting in a program error.

 

I don't want to understand why, % [\ n] is not stopped when I read the first non \ n. I can ignore this with an asterisk, and then % d can read the input. The result is incorrect. Thank you!

 

4,

Use setbuf (stdin, null); clear Cache

The function prototype of setbuf is

Void Setbuf ( File * Stream , Char * Buf ) ;