Unknown Error(c-lang), while reading a character from file

This is a discussion on Unknown Error(c-lang), while reading a character from file within the C++ Programming forums, part of the General Programming Boards category; I wrote a code in C to read a character from external .txt file. The codes are given below. #include<stdio.h> ...

  1. #1
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    Question Unknown Error(c-lang), while reading a character from file

    I wrote a code in C to read a character from external .txt file. The codes are given below.

    #include<stdio.h>

    void main()
    {
    FILE *in;
    unsigned char ch;
    in=fopen("file.txt","r");
    while((ch=fgetc(in))!=EOF)
    {
    printf("%c",ch);
    }
    }

    after campile it gave the warning :
    (ch=fgetc(in))!=EOF) is always true and would be in infinite loop.

    But when I removed the unsigned declaration of ch it works fine.

    Please, tell me , Why did it give me Warning like that ?

  2. #2
    Registered User Scribbler's Avatar
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    EOF typically is the integer value -1.

    Since you defined unsigned char ch; the variable ch is an unsigned value, which will never be able to be -1.

    Also...try remember to post your code inside of [code] tags. And also try to keep questions pertaining to C in the C forums (this is the C++ forum).
    Last edited by Scribbler; 01-14-2005 at 03:29 AM.

  3. #3
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    Also remember to use int main() instead of void main().

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