Article ID: 41159
Article Last Modified on 12/11/2003
APPLIES TO
- The C Run-Time (CRT), when used with:
- Microsoft Visual C++ 1.0 Professional Edition
- Microsoft Visual C++ 1.5 Professional Edition
- Microsoft Visual C++ 1.51
- Microsoft Visual C++ 1.52 Professional Edition
- Microsoft Visual C++ 1.0 Professional Edition
- Microsoft Visual C++ 2.0 Professional Edition
- Microsoft Visual C++ 2.1
- Microsoft Visual C++ 4.0 Standard Edition
- Microsoft Visual C++ 5.0 Standard Edition
- Microsoft Visual C++ 6.0 Service Pack 5
This article was previously published under Q41159
SUMMARY
To clear the keyboard buffer in Microsoft C use the function rewind() with the stream STDIN, which is associated with the keyboard by default. The function fflush() clears the buffers that C programs use for stream level I/O. It does not clear the device buffer. The following is an example that shows what happens when the keyboard buffer is not cleared, and then how to clear it:
Sample Code
/* Compile options needed: none */ #include <stdio.h> void main(void) { int ch ; puts( "Input two or more chars. One is read now." ); ch = getchar(); putchar( ch ); putchar( '\n' ); puts( "The next char is taken from stdin." ); ch = getchar( ); putchar( ch ); putchar( '\n' ); rewind( stdin ); puts( "Input two or more chars. One is read now." ); ch = getchar(); putchar( ch ); putchar( '\n' ); rewind( stdin ); puts( "You must enter another char because of the rewind(stdin)" ); ch = getchar( ); putchar( ch ); putchar( '\n' ); }
Additional query words: 8.00 8.00c 9.00 9.10
Keywords: kbinfo kbcrt kbcode KB41159