This is a very simple snippet, but one I was looking around for last night. Since I was never really a C programmer, it takes me to much time to figure out the printf format. Anyway, the data I have for RGB color info was 3 decimal numbers and I needed to have them converted into the HTML hex color code to use as background for table cells.
$color = &RGBDecToHex(0, 102, 153);

sub RGBDecToHex {
  my ($red, $green, $blue) = @_;
  return sprintf("#%02lx%02lx%02lx", $red, $green, $blue);
}

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In reply to HTML RGB hex color by Anonymous Monk

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