Programming Forums > Application Development > C++

Twilight · Apr 20th, 2007, 4:53 PM

But there wasn't anything past that. At the previous prompt it would be a single digit input, and a newline.

DaWei · Apr 20th, 2007, 5:26 PM

Use a debugger. Your voodoo won't be effective. Or, you could just read the thread and comprehend what it's saying, and read the descriptions of the functions, and use the facts.

Twilight · Apr 20th, 2007, 9:33 PM

Well, I've read through the thread, and many others. I think I'm just missing something simple. When I tried the common version I found around the internet, it looks basically like this:

(Toggle Plain Text)

     cout << "Enter a number from 1-5" << endl;
     cin >> choice; // choice is a string I convert to an int

     //various functions do various things, then print stuff.  I need it to wait
     //before clearing the screen and proceeding.

     std::cin.clear(); 
     std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
     std::cout << "Press Enter to continue . . .\n";
     cin.get();

Its my understanding that ignore will remove everything in the input stream, including the first newline it sees. And since there can only be one newline (unless cin is leaving them there, which seems unlikely) from user input, it should ignore the whole stream, and then wait for cin.get(). But it doesn't, and I don't know why.

DaWei · Apr 20th, 2007, 10:32 PM

Wrong about the number of newlines. If the user types 123<ENTER> five times with no intervening reads of the stream, they're all in there. I won't say you're making a mountain out of a molehill, but you're certainly ignoring all the bulldozers sitting around idle.

Apr 20th, 2007, 5:26 PM	#22
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	Use a debugger. Your voodoo won't be effective. Or, you could just read the thread and comprehend what it's saying, and read the descriptions of the functions, and use the facts. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Apr 20th, 2007, 9:33 PM	#23
Twilight Programmer Join Date: Apr 2006 Location: Calgary, Alberta Posts: 67 Rep Power: 3	Well, I've read through the thread, and many others. I think I'm just missing something simple. When I tried the common version I found around the internet, it looks basically like this: (Toggle Plain Text) cout << "Enter a number from 1-5" << endl; cin >> choice; // choice is a string I convert to an int //various functions do various things, then print stuff. I need it to wait //before clearing the screen and proceeding. std::cin.clear(); std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); std::cout << "Press Enter to continue . . .\n"; cin.get(); cout << "Enter a number from 1-5" << endl; cin >> choice; // choice is a string I convert to an int //various functions do various things, then print stuff. I need it to wait //before clearing the screen and proceeding. std::cin.clear(); std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); std::cout << "Press Enter to continue . . .\n"; cin.get(); Its my understanding that ignore will remove everything in the input stream, including the first newline it sees. And since there can only be one newline (unless cin is leaving them there, which seems unlikely) from user input, it should ignore the whole stream, and then wait for cin.get(). But it doesn't, and I don't know why.

Apr 20th, 2007, 10:32 PM	#24
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	Wrong about the number of newlines. If the user types 123<ENTER> five times with no intervening reads of the stream, they're all in there. I won't say you're making a mountain out of a molehill, but you're certainly ignoring all the bulldozers sitting around idle. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

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Apr 20th, 2007, 4:53 PM	#21
Twilight Programmer Join Date: Apr 2006 Location: Calgary, Alberta Posts: 67 Rep Power: 3	But there wasn't anything past that. At the previous prompt it would be a single digit input, and a newline.

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Programming Forums > Application Development > C++

Why do I have to enter two cin.get()?