remove ! character from a stream

This is a discussion on remove ! character from a stream within the C Programming forums, part of the General Programming Boards category; How do you remove a character from a string please could anyone tell me how to do it?...

  1. #1
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    remove ! character from a stream

    How do you remove a character from a string please could anyone tell me how to do it?

  2. #2
    Woof, woof! zacs7's Avatar
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    Move everything past the character you want to remove to cover it up.

    For example, "abxcde". If you want to delete 'x', move "cde" left by one position.

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    remove ! character from a stream
    How do you remove a character from a string
    Well what one are you talking about?

    I assume you're talking about strings (i.e. "char*"). Say you want to remove the "u" from "pound", what do you do? Well you basically "shift" the contents of the string once to the left, starting from after the "u" to the end of the string. So you "shift" the characters after the "u", which are "nd", one position/index to the left. So "pound" becomes "pond". There are a number of ways to do this, the easiest being a simple for loop. Other methods would be "strcpy", "memcpy", "memmove". The reference for "memmove" has a relevant example.

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    thing is i need to remove !#"$%^&*()_+ as well would this work by the way my programming is at the lowest level some syntax would be really really helpful

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    Quote Originally Posted by nadroj View Post
    Well what one are you talking about?

    I assume you're talking about strings (i.e. "char*"). Say you want to remove the "u" from "pound", what do you do? Well you basically "shift" the contents of the string once to the left, starting from after the "u" to the end of the string. So you "shift" the characters after the "u", which are "nd", one position/index to the left. So "pound" becomes "pond". There are a number of ways to do this, the easiest being a simple for loop. Other methods would be "strcpy", "memcpy", "memmove". The reference for "memmove" has a relevant example.
    sorry i have a file that is stored in a stream from a text file hope this helps

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    Woof, woof! zacs7's Avatar
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    You could just get clever with sscanf() and fgets(). Stopping at unwanted characters before doing another sscanf().

    For example:
    Code:
    char buffer[256];
    char wanted[256];
    
    fgets(buffer, sizeof(buffer), stdin);
    
    sscanf(buffer, "%[^xyz]", wanted);  /* wanted will now contain anything up to 'x', 'y' OR 'z'. */
    /* more sscanf()'s... */

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    OK well the same basic principle applies. We can assume the contents of the file is "pound" and you want to remove the "u". You still have to linearly (i.e. one by one) "shift" the contents after the "u", one character to the right. If you have a longer sequence of chars to remove, say "oun", then simply shift 3 characters instead of 1. The actual char(s) in question doesn't matter as long as they're simple 1-byte ASCII characters.

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    Quote Originally Posted by zacs7 View Post
    You could just get clever with sscanf() and fgets(). Stopping at unwanted characters before doing another sscanf().

    For example:
    Code:
    char buffer[256];
    char wanted[256];
    
    fgets(buffer, sizeof(buffer), stdin);
    
    sscanf(buffer, "%[^xyz]", wanted);  /* wanted will now contain anything up to 'x', 'y' OR 'z'. */
    /* more sscanf()'s... */
    i have tried this way but it compiles but just hangs

    update
    i have got it working as such but the output file is blank
    Last edited by Boogyman; 02-24-2010 at 07:21 PM. Reason: update

  9. #9
    Woof, woof! zacs7's Avatar
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    Even simpler, just use fgets() and take what you want.

    Code:
    zac@neux:code (0) $ gcc want.c -o want
    zac@neux:code (0) $ ./want 
    We don't any stupid characters! That includes your filthy $100 note. "Haha".
    We don't any stupid characters That includes your filthy 100 note. Haha.
    zac@neux:code (0) $ cat want.c 
    #include <stdio.h>
    #include <string.h>
    
    int main(void)
    {
       char buffer[256];
       char * ch = buffer;
       const char unwanted[] = "!#\"$%^&*()_+";
    
       fgets(buffer, sizeof(buffer), stdin);
    
       while(*ch)
       {
          /* If *ch is not found in 'unwanted', we must want it */
          /* ... snip ... You have to do something */
          ++ch;
       }
    
       return 0;
    }

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    You have a PM.

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