Gdtyjr

In a document containing a lot of other stuff, I have the following code which I have kept in verbatim(for lack of other ideas). As you can see, the alignment doesn't look so good.

How do I make it more presentable, so that it becomes more readable, with indentation perhaps(verbatim doesnt seem to handle spaces and tabs)?

documentclass[]article 
begindocument 
beginverbatim 

 if (n == 0 || n == 1) 
 return n; 
 
 j = 0; 
 for (i = 0; i < n-1; i++) 
 if (arr[i] != arr[i+1]) 
 arr[j] = arr[i]; 
 j++; 
 
 
 arr[j++] = arr[n-1]; 


endverbatim 
enddocument 

Something like this?

documentclassbook
usepackagelistings

lstdefinestylemyListingStyle 
 
 basicstyle = smallttfamily,
 breaklines = true,
 

begindocument

beginlstlisting[
 style = myListingStyle,
 caption = Nice listing.
 ]
 if (n == 0 || n == 1) 
 return n; 
 
 j = 0; 
 for (i = 0; i < n-1; i++) 
 if (arr[i] != arr[i+1]) 
 arr[j] = arr[i]; 
 j++; 
 
 
 arr[j++] = arr[n-1]; 
endlstlisting

enddocument

See Put a grey background behind code extracts in a Latex document (like this site does) for example for adding a background color. It's also possible to load the code from an external file -- just have a look at related questions.

Verbatim

Contrary to what you claim in your question, verbatim supports spaces and indentation, so why not use it?

documentclass[]article 
begindocument 
beginverbatim
 if (n == 0 || n == 1) 
 return n; 
 
 j = 0; 
 for (i = 0; i < n-1; i++) 
 if (arr[i] != arr[i+1]) 
 arr[j] = arr[i]; 
 j++; 
 
 
 arr[j++] = arr[n-1];
endverbatim 
enddocument 

Listings

The listings package can add colors.

documentclass[]article
usepackagelistings
usepackagexcolor
lstsetbasicstyle=ttfamily,language=c,keywordstyle=colorblue
begindocument 
beginlstlisting
 if (n == 0 || n == 1) 
 return n; 
 
 j = 0; 
 for (i = 0; i < n-1; i++) 
 if (arr[i] != arr[i+1]) 
 arr[j] = arr[i]; 
 j++; 
 
 
 arr[j++] = arr[n-1];
endlstlisting 
enddocument 

Minted

The minted package is even more powerful…

% arara: pdflatex: shell: yes
documentclass[]article
usepackageminted
begindocument 
beginmintedc
 if (n == 0 || n == 1) 
 return n; 
 
 j = 0; 
 for (i = 0; i < n-1; i++) 
 if (arr[i] != arr[i+1]) 
 arr[j] = arr[i]; 
 j++; 
 
 
 arr[j++] = arr[n-1];
endminted 
enddocument 

Tcblisting

You can of course combine it with tcolorbox or something else…

% arara: pdflatex: shell: yes
documentclass[]article
usepackageminted
usepackage[minted]tcolorbox
newtcblistingmylistinglisting only,listing engine=minted, minted language=c,colback=gray!20
begindocument 
beginmylisting
if (n == 0 || n == 1) 
 return n; 
 
j = 0; 
for (i = 0; i < n-1; i++) 
 if (arr[i] != arr[i+1]) 
 arr[j] = arr[i]; 
 j++; 
 
 
arr[j++] = arr[n-1];
endmylisting 
enddocument 

As already stated by others, verbatim does work for code (I use it for that purpose). The issue you see is that you usually format your code with tabs which verbatim is ignoring for some reason. So what I do is I put my code into verbatim select it and replace tabs with say 4 (or any number for that matter) of spaces (but just inside the selection).