Problems with Getch() program execution order

This is a discussion on Problems with Getch() program execution order within the C++ Programming forums, part of the General Programming Boards category; I'm having problems with the getch() function. The following program executes like this: (type in "napKIN" then <enter>) (output)napKINHow do ...

  1. #1
    napKINfolk.com napkin111's Avatar
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    Problems with Getch() program execution order

    I'm having problems with the getch() function. The following program executes like this:
    (type in "napKIN" then <enter>)
    (output)napKINHow do I make this appear before the input?

    I want it to say the text, then output the input.

    Here is my code:

    Code:
    #include <conio.h>
    #include <iostream.h>
    
    char text;
    
    int main()
    {
    	cout<<"How do I make this appear before the input?";
    	while ((text=getch()) != '\r')
    		cout<<text;
    	cout<<"\n"<<text;
    	return 0;
    }

    Could someone please tell me how to do this, please?

    napKIN

  2. #2
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    Try this:

    cout<<"How do I make this appear before the input?" << flush;

  3. #3
    and the hat of wrongness Salem's Avatar
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    In addition, C and C++ i/o streams may not be synchronised, which can lead to some surprises - like getting the same data twice.

    Choose an i/o mechanism and stick to it

  4. #4
    Registered User hk_mp5kpdw's Avatar
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    After your first output statement, send endl to the cout stream as well. That automatically flushes the buffer.
    "Owners of dogs will have noticed that, if you provide them with food and water and shelter and affection, they will think you are god. Whereas owners of cats are compelled to realize that, if you provide them with food and water and shelter and affection, they draw the conclusion that they are gods."
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  5. #5
    Registered User Liam Battle's Avatar
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    if you are going to be mixing I/O streams be used to problems like that alot...

    I suggest just use the IOSTREAM for minor output and input, else make your own I/O stream (thats what i do)
    LB0: * Life once school is done
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