getch() getchar() no need 4 fflush?

This is a discussion on getch() getchar() no need 4 fflush? within the C Programming forums, part of the General Programming Boards category; Hi Im new here and just learning C. Im using VTC video tutorials. The guy on it is saying that ...

  1. #1
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    getch() getchar() no need 4 fflush?

    Hi Im new here and just learning C. Im using VTC video tutorials. The guy on it is saying that I have to put in fflush(stdin); to keep the window open so it dosent automatically close.
    here is the code I was supposed to put it into.

    Code:
    main()
    {
          short age;
          printf ("How old are you: ");
          scanf ("%d", &age);
          printf ("The age you have entered is %d\n", age);
          getchar();
          
    }
    I was supposed to put it above getchar();
    But I put getch(); and it didnt close the window, so is getch();
    an exceptable replacement for using fflush(stdin); ?

  2. #2
    and the hat of wrongness Salem's Avatar
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    > The guy on it is saying that I have to put in fflush(stdin);
    Great, another "teacher" selling snake oil.

    Read
    http://faq.cprogramming.com/cgi-bin/...&id=1043284351

    Also
    http://faq.cprogramming.com/cgi-bin/...&id=1043284385
    http://faq.cprogramming.com/cgi-bin/...&id=1043284385


    Your scanf() call is wrong as well, %d is for reading ints, not shorts.

  3. #3
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    No its not that I dont trust him. I saw someone using getch();
    So I thought it was short for getchar(); and tried using it and the window stayed up. When I used getchar(); the window closed. Also the short was int I was just trying something else there.

  4. #4
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    I just thought I found another way to do the same thing is all. :\

  5. #5
    and the hat of wrongness Salem's Avatar
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    getch() is specific to your compiler
    getchar() is standard.

    The two 'streams' do not have to be synchronised, so doing
    c1 = getchar();
    c2 = getch();
    Is not guaranteed to produce the effect of making c1='h' and c2='e' if you type in "hello"

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