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  • 1 Post By Adak
  • 1 Post By qny

how to define end of the input stream and of the file in c

This is a discussion on how to define end of the input stream and of the file in c within the C Programming forums, part of the General Programming Boards category; Hi there is there a way to determine end of the standart input stream and end of a file? I ...

  1. #1
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    Oct 2012
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    5

    how to define end of the input stream and of the file in c

    Hi there is there a way to determine end of the standart input stream and end of a file? I tried to do it like EOF but it doesn't work moreover, as an output it produces weird things.
    Here is my code:
    Code:
    #include <stdio.h>
    int strip(char *arr)
    {
            int i=0;
            while (1){
                    char c =getchar();
                    if (c!=' '&& c!= '\t')
                    {
                            arr[i]=c;
                            i+=1;
                            printf ("%c\n", c);
                    }
                    else if (c == EOF){
                    printf ("4\n");
                            break;
                    }
            }
     while(i>0)
            {
                    printf ("%c", arr[i]);
                    i-=1;
            }
    return 0;
    }
    int main()
    {
            char arr[100];
            printf ("Enter some string: \n");
            strip(arr);
    }
    what I wanted is to print standart input without spaces utill it gets to the end of the string. and if I am runing it like ./myprog <text.txt
    where text.txt contains Hello there .. the output is:











    Segmentation fault

    Thanks in advance!

  2. #2
    Registered User
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    getchar() returns an int.

    That is, change c from a char variable, to an int. Then it works.
    Last edited by Adak; 10-16-2012 at 03:52 PM.
    chess_queen likes this.

  3. #3
    qny
    qny is offline
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    Sep 2012
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    getchar() returns an int with good (very good) reason. You must define c as int too.

    Other than that, your ifs do not do what you hoped they'd do.
    If c is not a space and c is not a tab includes c being EOF; the else part of the if will never run when c is EOF.
    chess_queen likes this.

  4. #4
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    Don't know if you're acquainted yet with ctype.h, but it has a function that could be useful here:

    Code:
    #include <ctype.h>
    
    
    
    if (isalpha(c)) {
        etc.
    
    
    }else if(etc.) {
       //etc.
    
    }

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