I tried this: 
#!/usr/bin/perl

use IO::File;

$stuff="0.4312342134234234";
$morestuff="0.2432134234342342";

$fh=IO::File->new(">/tmp/foo2.txt");
$fh=sprintf($fh <<"__EOFOO__", $stuff, $morestuff);
Some stuff: %.4f
Some more stuff %.4f
__EOFOO__

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But I get: 
Missing comma after first argument to sprintf function at test.pl line
+ 12, near "$morestuff)"
  (Might be a runaway multi-line << string starting on line 9)
Execution of test.pl aborted due to compilation errors.

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In reply to Re^2: IO::File handle and printf by rakzer
in thread IO::File handle and printf by rakzer

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