How to name and create many files in a loop

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In C, I want to create and open text files to write data into, but the problem is I want to name the files on the go, such as
<pre class="lang-c prettyprint prettyprinted

<span class="typ FILE<span class="pln  <span class="pun *<span class="pln ptr<span class="pun ;<span class="pln 

<span class="kwd for<span class="pun (<span class="pln i<span class="pun =<span class="lit 0<span class="pun ;<span class="pln i<span class="pun <<span class="lit 1000<span class="pun ;<span class="pln i<span class="pun ++){<span class="pln 
   fopen_s<span class="pun (&<span class="pln ptr<span class="pun ,<span class="str "i.txt"<span class="pun ,<span class="str "w"<span class="pun );<span class="pln 
   operations to fill data into file i<span class="pun .<span class="pln txt<span class="pun ;<span class="pln 
   fclose<span class="pun (<span class="pln ptr<span class="pun );<span class="pln 
<span class="pun }

[/code]
such that I will create file 0.txt, 1.txt, 2.txt ... 999.txt.
How is this possible? I checked open and rename functions, but couldnt find a way to do.
Thank you so much for all your help.<br/>
Best,



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