How can I clear buffer between getch & cin?

[voidstar]

Hi, I have the following problem:

I use "getch" to monitor keypresses and the I use "cin" to input a
string.

When I type in 'y', the 'y' character appears, so I need to hit backspace
before typing the string.

c = getch();
cin >> str;

Please help me!
Thanks in advance
voidstar

[John Harrison]

On Wed, 21 Jul 2004 20:31:04 GMT, voidstar <vo******@tin.it> wrote:

Hi, I have the following problem:

I use "getch" to monitor keypresses and the I use "cin" to input a
string.

When I type in 'y', the 'y' character appears, so I need to hit backspace
before typing the string.

c = getch();
cin >> str;

Please help me!
Thanks in advance
voidstar

getch is not part of standard C++, cin is part of standard C++. If you try
an mix the two then the results are going to be unpredictable. Basically
don't do it.

Standard C++ has no way of monitoring keypresses, so if you need to do
this then you should forget about using standard C++ for any console input
or output.

john

[Ash]

John Harrison wrote:

On Wed, 21 Jul 2004 20:31:04 GMT, voidstar <vo******@tin.it> wrote:

Hi, I have the following problem:

I use "getch" to monitor keypresses and the I use "cin" to input a
string.

When I type in 'y', the 'y' character appears, so I need to hit backspace
before typing the string.

c = getch();
cin >> str;

Please help me!
Thanks in advance
voidstar

getch is not part of standard C++, cin is part of standard C++. If you
try an mix the two then the results are going to be unpredictable.
Basically don't do it.

Standard C++ has no way of monitoring keypresses, so if you need to do
this then you should forget about using standard C++ for any console
input or output.

john

All true, but I found that it is compiler dependant. For example, in
Borland's compiler:

ch = getch();
switch(ch){
//select stuff
}
cin >> string; //or even cin.getline(const char[], int)

after pressing a button to be used in the switch() statement, that char
would be placed at the beginning of the string's array. However, using
Bloodshed's Dev-C++ IDE, it seems to 'clear the buffer'. I have, however
heard of functions that do this. I think http://www.cplusplus.com, but
I'm not sure.

[Mark R Rivet]

I believe you should do a "cin>>ws;"
the "ws" means white space and should clear the buffer after you do
the getch();
On Tue, 27 Jul 2004 01:17:24 GMT, Ash <fu******@nb.sympatico.ca>
wrote:

John Harrison wrote:

On Wed, 21 Jul 2004 20:31:04 GMT, voidstar <vo******@tin.it> wrote:

Hi, I have the following problem:

I use "getch" to monitor keypresses and the I use "cin" to input a
string.

When I type in 'y', the 'y' character appears, so I need to hit backspace
before typing the string.

c = getch();
cin >> str;

Please help me!
Thanks in advance
voidstar

getch is not part of standard C++, cin is part of standard C++. If you
try an mix the two then the results are going to be unpredictable.
Basically don't do it.

Standard C++ has no way of monitoring keypresses, so if you need to do
this then you should forget about using standard C++ for any console
input or output.

john

All true, but I found that it is compiler dependant. For example, in
Borland's compiler:

ch = getch();
switch(ch){
//select stuff
}
cin >> string; //or even cin.getline(const char[], int)

after pressing a button to be used in the switch() statement, that char
would be placed at the beginning of the string's array. However, using
Bloodshed's Dev-C++ IDE, it seems to 'clear the buffer'. I have, however
heard of functions that do this. I think http://www.cplusplus.com, but
I'm not sure.