getche() with cin.getline() ?

This is a discussion on getche() with cin.getline() ? within the C++ Programming forums, part of the General Programming Boards category; Hi, I have this simple excersize.. Using the getche() function to read the characters, write your own version of the ...

  1. #1
    Registered User marCplusplus's Avatar
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    getche() with cin.getline() ?

    Hi,

    I have this simple excersize..

    Using the getche() function to read the characters, write your own version of the cin.getline() function. Include the default argument for the terminating character.

    I can't understand how I may use getche() with cin.getline().
    I thought its either one or the other..

    What do you suggest?
    Thanks!!!
    Marc
    No matter how much you know, you NEVER know enough.

  2. #2
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    The function is getch(), not getche(), unless there's one I don't know. The exercise probably calls for getche()so that the names don't conflict. You create the getche() function, and you don't use getline(). From what you wrote, you're supposed to write a function that does the same thing as getline().
    Anyway, try putting getch()in a while loop that tests for the delimiter character.

  3. #3
    _B-L-U-E_ Betazep's Avatar
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    >>>unless there's one I don't know

    Then there is one you don't know.

    getche() stands for get character echo.

    getch() doesn't echo the character to the screen whereas getche() does.

    It is really that simple.

    >>Using the getche() function to read the characters, write your own version of the cin.getline() function. Include the default argument for the terminating character.

    It doesn't say to use getche() with cin.getline(). You are supposed to make a function that acts like cin.getline().

    You need to loop getche(character[counter]) until your term character is found in character[counter].

    while (character[counter] != termchar)
    {
    getche(....); // that is all I am giving you. It isn't my assignment

    ...
    }

    If that doesn't give you ideas, PM me and I will help you.
    Blue

  4. #4
    Registered User marCplusplus's Avatar
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    i got it to work...
    I hope this is what I had to do..

    #include <iostream.h>
    #include <conio.h>
    void main()
    {
    char ch = 'x';
    char termchar = 'q';
    char character[30];
    int counter = 0;
    while (ch != termchar )
    {
    ch = getche();
    character[counter++] = ch;
    }
    }

    thanks!
    Marc
    No matter how much you know, you NEVER know enough.

  5. #5
    It's full of stars adrianxw's Avatar
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    >>> It doesn't say to use getche() with cin.getline().

    Indeed. Using old C type I/O in the same dialog as C++ stream I/O on the same comms channel is fraught with problems due to the different ways they are buffered, (or in some cases not buffered at all). Use one or the other, not both.
    Wave upon wave of demented avengers march cheerfully out of obscurity unto the dream.

  6. #6
    _B-L-U-E_ Betazep's Avatar
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    #include <iostream.h>
    #include <conio.h>
    void main()
    {
    char ch = 'x';
    char termchar = 'q';
    char character[30];
    int counter = 0;
    while (ch != termchar )
    {
    ch = getche();
    character[counter++] = ch;
    }
    }


    You better double check. Try to cout character like

    cout << endl << character << endl;

    before you end main.

    Just because something compiles, doesn't mean that you are doing it right.
    Blue

  7. #7
    _B-L-U-E_ Betazep's Avatar
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    and instead of specifying the termchar, why don't you ask for it. Also, you should consider making this a function that is utilized from main.

    mygetline(*char[], maxnumber, termchar);

    Then you would call mygetline and pass values to it. That would make it work exactly (pretty much) like getline();

    Betazep
    Blue

  8. #8
    Registered User marCplusplus's Avatar
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    Thumbs down

    You were right
    mmm I tried this...

    #include <iostream.h>
    #include <conio.h>
    #include <string.h>
    void main()
    {
    char ch = 'x';
    char termchar = 'q';
    char character[30];
    int counter = 0;
    while (ch != termchar )
    {
    ch = getche();
    character[counter++] = ch;
    }
    int q = strlen(character);
    for (int j=0; j<q; j++)
    cout << character[j];
    }

    And now, I donno what's happening.
    When I press q, the word i wrote comes...butright after it, loadz of funny characters come on the screen

    I donno what I'm doing wrong

    MMM anyway thanks
    Marc
    No matter how much you know, you NEVER know enough.

  9. #9
    _B-L-U-E_ Betazep's Avatar
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    #include <iostream>
    #include <conio>
    using namespace std;

    int main()
    {
    char character[10];
    char termchar ='#';

    int count=-1;

    while ((character[count] != termchar) && (count < 9))
    {

    count++;
    character[count] = getche();


    }
    if (character[count] == termchar)
    character[count] ='\0'; // overwrite last term char
    else
    character[count+1] = '\0'; // write null after last char
    cout << endl << character;

    return 0;
    }
    Last edited by Betazep; 12-21-2001 at 02:43 AM.
    Blue

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