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<title>Mu - real-files.mu</title>
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<pre id='vimCodeElement'>
<span class="Comment"># example program: read a character from one file and write it to another</span>
<span class="Comment"># BEWARE: this will modify your file system</span>
<span class="Comment"># before running it, put a character into /tmp/mu-x</span>
<span class="Comment"># after running it, check /tmp/mu-y</span>
<span class="muRecipe">def</span> main [
<span class="Constant">local-scope</span>
f:num/file<span class="Special"> <- </span>$open-file-for-reading <span class="Constant">[/tmp/mu-x]</span>
$print <span class="Constant">[file to read from: ]</span>, f, <span class="Constant">10/newline</span>
c:char, eof?:bool<span class="Special"> <- </span>$read-from-file f
$print <span class="Constant">[copying ]</span>, c, <span class="Constant">10/newline</span>
f<span class="Special"> <- </span>$close-file f
$print <span class="Constant">[file after closing: ]</span>, f, <span class="Constant">10/newline</span>
f<span class="Special"> <- </span>$open-file-for-writing <span class="Constant">[/tmp/mu-y]</span>
$print <span class="Constant">[file to write to: ]</span>, f, <span class="Constant">10/newline</span>
$write-to-file f, c
f<span class="Special"> <- </span>$close-file f
]
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