problems in removing white spaces from string of text

This is a discussion on problems in removing white spaces from string of text within the C Programming forums, part of the General Programming Boards category; Hi, I need to write a program that shall strip all white spaces from a given string with just 1 ...

  1. #1
    Registered User
    Join Date
    Mar 2005
    Posts
    2

    problems in removing white spaces from string of text

    Hi,

    I need to write a program that shall strip all white spaces from a given string with just 1 space after each word.

    Eg. If I give the following string

    Code:
    rm        asd.txt   tmp.txt                 hgfh.txt
    Note: There are training spaces in beginnign and the end...

    It should return me

    Code:
    rm asd.txt tmp.txt hgfh.txt
    Also, After the tring is formatted properly, i need to pair up the 1st and the next word.

    Like
    Code:
    rm asd.txt
    rm tmp.txt
    rm hgfh.txt
    Heres the code that i am using...

    Code:
    #include <stdio.h>
    #include <string.h>
    
    int main()
    {
      char tmp[100], cmd[100], arg[100];
      int cnt=0, spc_cnt=0, i;
    
      for(cnt=0; cnt < 100; cnt++)
    {
        tmp[cnt] = NULL;
        cmd[cnt] = NULL;
        arg[cnt] = NULL;
    }
    
    printf("Please enter some text... ");
    gets(tmp);
    
    i=0;
    for(cnt=0; ( cnt<100 ) || (tmp[cnt] == NULL); cnt++)
    {
            if( tmp[cnt] == ' ' )
            {
                    ;
            }
            else
            {
                    for( ; (cnt<100) || (tmp[cnt] == NULL); cnt++, i++)
                    {
                            if( tmp[cnt] != ' ' )
                            {
                                    cmd[i] = tmp[cnt];
                            }
                            else
                            {
                                    cmd[i] = ' ';
                                    cnt++; i++;
                                    break;
                            }
                    }
            }
    }
      printf("TMP: %s\n", tmp);
      printf("CMD: %s\n", cmd);
      printf("ARG: %s\n", arg);
      return 0;
    }
    Heres the output I get...

    Please enter some text... asd fghfgh rtytr
    TMP: asd fghfgh rtytr
    CMD: asd ghfgh tytr
    ARG:

    in CMD, second argument , f is missing... and in third argument, r is missing.

    Please help me get away from this error..

    Thank you.

    -Monil

  2. #2
    ATH0 quzah's Avatar
    Join Date
    Oct 2001
    Posts
    14,826
    Rather than go through your code, let me tell you a simple way to do this:
    Code:
    while you're not at the end of your string
        while isspace
            skip this letter
        while !isspace
            copy this character
    Naturally you need to check for reaching the end of the string in those two inner loops. But that's the very simple way to do this. There are lots of ways to do this, but that's quite a simple process. And actually, were you yourself to do this by hand, that's exactly the way you'd do it.

    Quzah.
    Hope is the first step on the road to disappointment.

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