is there a way to replace EOF in this loop..

This is a discussion on is there a way to replace EOF in this loop.. within the C Programming forums, part of the General Programming Boards category; we havent learned files there is no End Of File in this program can i change it into '

  1. #1
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    is there a way to replace EOF in this loop..

    we havent learned files
    there is no End Of File in this program
    can i change it into '\0'
    or some like that?
    Code:
     for (i = 0; i < 39 && (ch = getchar()) != '\n' && ch != EOF; ++i)
                {
                    input2[i] = ch;
                }
    
                input2[i] = '\0';

  2. #2
    Woof, woof! zacs7's Avatar
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    What?!

    The current code will change the last valid character into NUL. Not what you want, infact you don't want anything.

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    i want to keep this loop doing what it does but
    without EOF

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    Woof, woof! zacs7's Avatar
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    It already does... perhaps brush up on your loops.

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    so i can delete this EOF condition?

  6. #6
    Woof, woof! zacs7's Avatar
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    No... because the condition stops you from putting EOF in the array.

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    getchar() returns EOF on *error* or when it reaches the EOF.

    So getchar() will return EOF, even if there *is* no EOF char at the end of the file!

    So I believe you will want to keep EOF just where it is, in your for statement.

    Can you show the input that the for statement is not handling right?

  8. #8
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    this loop works fine

    but i cant use the term EOF

    i am looking for a way to replace it

  9. #9
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    Quote Originally Posted by transgalactic2 View Post
    this loop works fine

    but i cant use the term EOF

    i am looking for a way to replace it
    Why? Because your teacher says "You can't use that"? If so, remove it - but be aware that it IS correct to have EOF there.

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

  10. #10
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    is there a way to state EOF in getchar() terms

    like
    Code:
    for (i = 0; i < 39 && (ch = getchar()) != '\n' && ch !=(getchar error); ++i)
                {
                    input2[i] = ch;
                }
    
                input2[i] = '\0';

  11. #11
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    Quote Originally Posted by transgalactic2 View Post
    is there a way to state EOF in getchar() terms

    like
    Code:
    for (i = 0; i < 39 && (ch = getchar()) != '\n' && ch !=(getchar error); ++i)
                {
                    input2[i] = ch;
                }
    
                input2[i] = '\0';
    That is what EOF means - something went wrong when reading the next character [most often because you reached end of file or pressed CTRL-D/CTRL-Z on the keyboard - but anything that "fails" the read itself will return EOF from getchar()].

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    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

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    What will happen if i will remove this EOF condition regarding the string??

    will it stop putting chars into the string and put '\0' like before

  13. #13
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    Quote Originally Posted by transgalactic2 View Post
    What will happen if i will remove this EOF condition regarding the string??

    will it stop putting chars into the string and put '\0' like before
    In most situations NOTHING will change. However, if you happen to receive an EOF, it will continue to fill the string with EOF (converted to a character). And unless some part of your code detects and exits (or does something else meaningful) on EOF, it will loop forever.

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

  14. #14
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    how can i recieve EOF in the running of a program?
    or in the string input part??

  15. #15
    C++まいる!Cをこわせ! Elysia's Avatar
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    Can you actually read? I am having my doubts here...
    You only seem to notice what you want and ignore everything else...
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.
    For information on how to enable C++11 on your compiler, look here.
    よく聞くがいい!私は天才だからね! ^_^

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