C++ question

TriggerJ · 09-20-2003, 07:04 PM

How would you program in C++ to "hit any key to conitue?"

Thanks,

J-

kev82 · 09-20-2003, 07:11 PM

would depend what libraries i was using, with in a basic terminal without curses i would probably just call cin.get();

there are a few good c++ tutorials on the net eg www.cplusplus.com

TriggerJ · 09-20-2003, 07:12 PM

Thanks, I appreciate the help...I'm just starting out!

nakkaya · 09-20-2003, 07:26 PM

you can decleare a variable(bogus variable) and accept that

like
int x;
cin>>x;

that will stop the programme from exiting and also there is system call

jinksys · 09-20-2003, 08:59 PM

If you want to implement a true, "Press any key to continue..." prompt, you will first have to change the way the unix terminal handles input. The standard buffered IO in un*x doesn't send the buffer to the program until a EOF or newline is entered. That is why you have to press enter if you use cin.get() or getchar, or the like. Raw (unbuffered or cooked mode) IO sends input as it is recieved, and this is what you want. You can change terminal attributes by using the stty command from inside your program. For simplicity I used the C function, system(), inside the sample code below to execute my terminal commands, but in practice you should learn to use the C exec family of functions. They are more secure and robust than system(). The code below enters raw mode, waits for one character, enters back into normal "cooked" mode, and then exits.

Code:

#include <iostream> 
#include <stdio.h>  

using namespace std;  

int main() { 
//Output prompt 
cout << "Press any key to continue..." << endl; 

//Set terminal to raw mode 
system("stty raw"); 

//Wait for single character 
getchar(); 

//Reset terminal to normal "cooked" mode 
system("stty cooked"); 

//And we're out of here 
return 0; 
}

TriggerJ · 09-20-2003, 10:05 PM

Thanks, that really helped.

Jessica

jinksys · 09-20-2003, 11:24 PM

Ya welcome :-)

codedv · 12-04-2003, 12:06 PM

On the topic of stream buffers - could you port that code to Windows/Dos for the same behaviour?

jinksys · 12-04-2003, 03:02 PM

Sorry I can't. I left windows/Dos programming years ago for linux/unix programming and I dont miss a thing.

Hko · 07-22-2004, 05:07 AM

Quote:

Originally posted by codedv
On the topic of stream buffers - could you port that code to Windows/Dos for the same behaviour?

From what I remember abot DOS-programming, at least in Borland's Turbo C(++) you could do it simply with:

Code:

#include <conio.h>
while (!kbhit())
     ;

jinksys · 07-22-2004, 06:18 AM

wow, nearly 8 months since the last post to this thread.

escale · 08-23-2004, 03:55 PM

jinksys and others:

8/23/04 14:39 MST

Some of us are just getting to this now, a year after jinksys post. This information is still valuable and a reliable reference for those who follow.

When learning a new language I flip between reference docs like man files, info files and books. Then flip to sample code snippets that people here freely post. Between these two, I will have this language mastered in two months.

Thanks kev82 for that link to: www.cplusplus.com This site has tons of stuff on the STL that I couldn't find anywhere. That site will keep me busy for couple of months.

Thanks everyone.

Well, this was a useless, generic thank you of a post, sorry, it has no useful information. Carry on elsewhere.