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Need help for a beginner :)

Need help for a beginner :)

Need help for a beginner :)

Hi all. I can't figure out how to do this:
I have a String e.g. '1 2  3   4    '
I need to get this:   '4 3  2   1    '
Or i have:           ' one  two   three    four'
Need to get this: ' four  three   two    one'
And I need to do that WITHOUT arrays o.O
Any ideas?

RE: Need help for a beginner :)

to get help, you'd better convince people this isn't homework. It's a standard exercise set at the begining of many courses, and it's the time of year when many courses are just begining.

RE: Need help for a beginner :)


I agree with lionelhill, this quite smells like homework. However an interesting one, given the spaces which seems to need to be preserved.

CODE --> pseudocode

// set the reversed string to the original, but replace the groups of non-space characters with placeholders, for example $
original := ' one  two   three    four'
reversed := ' $  $   $    $'

currently_in_a_word := no // in original we are inside a group of non-space characters
current_placeholder := 0 // in reversed this is the current place_holder position
loop backward through original character by character
  current_character := original's current character
  if current_character is a space
    if currently_in_a_word
      currently_in_a_word := no
    end if
  else // not a space
    if not currently_in_a_word // first character of a non-space group
      currently_in_a_word := yes
      advance current_placeholder to the next one
      remove the placeholder character at current_placeholder
    end if
    insert current_character in reversed at current_placeholder
  end if
end loop


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