cin.get() Troubles

**yukapuka** · 06-04-2008

Add a function Display_Greeting() to prb05-1.cpp that displays the purpose of the program. After displaying the greeting, the function should pause and display

Press any key to continue

(Hint: use cin.get().) The program should then proceed as in the text. Use the function in the program. Recompile, execute, and test the resulting program.

This bastard of a question has really confused me, is this even possible?, to achieve that results" Press any key to continue" using cin.get() if somebody can please respond it would be
very much appreciated

**hk_mp5kpdw** · 06-04-2008

Output the message "Press any key to continue" using std::cout. Then, put your std::cin.get() call after that. What's so difficult about that?

**yukapuka** · 06-04-2008

you still have to press enter after pressing any key, i was looking for an answer where you press any key to achieve the same result as pressing return

**dwks** · 06-04-2008

For that, you'd need to use non-standard functions. For Windows, you might use:

Code:

#include <cstdlib>
std::system("pause");

For Dev-C++, you might be able to get getche() from conio.h to work.

There's an FAQ about this; I suggest you read it. http://faq.cprogramming.com/cgi-bin/...&id=1043284392

**Elysia** · 06-04-2008

With non-standard functions, it's possible, yes.
But my question is: why do you need it and where do you need it?

**dwks** · 06-04-2008

"Why do you need it?" It looks like an assignment to me.

An assignment based on this book.

http://books.google.ca/books?id=_q-6...l=en#PPA204,M1

**yukapuka** · 06-04-2008

so its impossible ?, also the link didn't work, i would like to examine it, yeah that evil evil book

**Elysia** · 06-04-2008

No, it's not impossible. You were told 2 different solutions.

**dwks** · 06-04-2008

Link didn't work, huh? You have to click on it, not copy it.

It brings you to page 204 of C++ for Business Programmers, which I'm pretty sure is the program you're supposed to be modifying.

Sure it's possible. Just not with standard C++. You have to use non-standard functions (or non-standard programs, with system()). Read my pos #4 again.

**Elysia** · 06-04-2008

Originally Posted by dwks

Link didn't work, huh? You have to click on it, not copy it.

Didn't work the first time, but the second time... now it worked!

**dwks** · 06-04-2008

In case you're wondering how I found it: stick "prb05-1.cpp" into Google.

**yukapuka** · 06-04-2008

what i mean is that it is impossible to acheive this result using only cin.get() by itself, see i am not familiar with the "pause" key

**dwks** · 06-04-2008

That is correct. You can't use cin.get() by itself to get unbuffered keyboard input. (That is, instantaneous input, as soon as you press a key, without waiting for enter to be pressed.)

You might be able to do it by unbuffering stdin first, but that would just be a hassle. You'd have to use non-standard functions to do that anyway.

Since they say to use cin.get(), I guess they're not concerned about having to press enter. Most of the time, it doesn't matter. Though I'd probably change the message to "Press enter to continue" in that case . . . .

**yukapuka** · 06-04-2008

this fellow Molluzo , is not the first time he makes mistakes with input output stream, earlier much earlier one question asked you to retrieve wit just the cin object letter from input stream , i emailed him and he said it was a mistake, so this question must also be a mistake as he hasnt introduced that into the book yet the 'pause' thing

**dwks** · 06-04-2008

I doubt the book mentions system("pause") in any great depth. Or at least, it shouldn't. Calling system("pause") is unportable (you have to have the "pause" program, which only Windows systems usually do). It's also insecure (make a virus called "pause", and it will be executed instead!). It's also very slow and inefficient, because a whole new process has to be spawned just to execute the pause program.

In case it wasn't clear: the system() function executes a command as if you had typed that string on the command line. In this case, it's executing the program "pause" (unless maybe pause is a shell builtin, but whatever).

"With just the cin object letter from input stream"? Could you elaborate?

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