In winter, Xiaoming's house turns on the heater to keep warm. Given that the indoor temperature is 12°C and the outdoor temperature is -5°C, how much is the indoor temperature higher than the outdoor temperature?
冬天，小明家开着暖气取暖．已知室内温度是12°C，室外温度是-5°C，那么室内温度比室外温度高多少℃．
<gadget id="calculator">12 - (-5)</gadget>
<output>17</output>

<result>17</result>