#x3057;&#x3066;&#x9069;&#x5207;&#x306B;&#x51E6;&#x7406;&#x3092;&#x7D9A;&#x3051;&#x307E;&#x3057;&#x3087;&#x3046;&#x3002;</p>
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> **Exercise:** I wrote a little program [here](https://ellie-app.com/bJSMQz9tydqa1) that converts from Celsius to Fahrenheit. Try refactoring the `view` code in different ways. Can you put a red border around invalid input? Can you add more conversions? Fahrenheit to Celsius? Inches to Meters?
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<p><strong>&#x6F14;&#x7FD2;:</strong> &#x6442;&#x6C0F;&#x304B;&#x3089;