trim char array C++

Question

How do i trim a char array ?

I'm reading this array from the text file and when it matches a certain string , ive to process it. But it never matches. I assume because it contains some trailing and leading spaces or\and '\n'

I dont know how to trim a char array but i used this to removes spaces. This has a problem that when token[0] = {0 0 0 0} this makes it {0000}. So i dont know what to do next..

char a[50] = {0};
int j = 0;

    //Removing spaces or garbage values in token[0] for perfect string match
    for(int i=0; (unsigned)i<strlen(token[0]) ; ++i )
    {
      if( (isalnum(token[0][i])) || token[0][i] == 95)
      {
        a[j]=token[0][i];
        j++;
      }
      else
      {
        continue;
      }
    }

Show us some code. What have you tried?

Joseph Mansfield
– Joseph Mansfield

2013-04-14 18:25:47 +00:00
Commented Apr 14, 2013 at 18:25 — Joseph Mansfield
– Joseph Mansfield, Commented Apr 14, 2013 at 18:25
.. So write some code to take care of those eventualities.

Ed Heal
– Ed Heal

2013-04-14 18:27:11 +00:00
Commented Apr 14, 2013 at 18:27 — Ed Heal
– Ed Heal, Commented Apr 14, 2013 at 18:27
Yes I'm trying to do that !

dharag
– dharag

2013-04-14 18:42:03 +00:00
Commented Apr 14, 2013 at 18:42 — dharag
– dharag, Commented Apr 14, 2013 at 18:42
@dharag - Why not post it and tell what is not working!

Ed Heal
– Ed Heal

2013-04-14 18:51:04 +00:00
Commented Apr 14, 2013 at 18:51 — Ed Heal
– Ed Heal, Commented Apr 14, 2013 at 18:51
Where is the array token being populated from?

Ed Heal
– Ed Heal

2013-04-14 19:02:11 +00:00
Commented Apr 14, 2013 at 19:02 — Ed Heal
– Ed Heal, Commented Apr 14, 2013 at 19:02

Shikher Gupta · Accepted Answer · 2013-04-14 18:37:57Z

3

Given that you have not mentioned anything else, the following could always be done:

copy the array(to be checked) to another array char by char to only the number of chars required...(this way you could also check how many chars you need to trim):

a=0;

while(array1[a] != '\0'){
    array2[a] = array1[a];
    a++;
}

array2[a] = '\0';

answered Apr 14, 2013 at 18:37

Shikher Gupta

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