text: import React from "react";
  import "./styles/App.css";
  import TemperatureInput from "./components/TemperatureInput";
  
  function toCelsius(fahrenheit) {
      return ((fahrenheit - 32) * 5) / 9;
  }
  
  function toFahrenheit(celsius) {
      return (celsius * 9) / 5 + 32;
  }
  
  function tryConvert(temperature, convert) {
      const input = parseFloat(temperature);
      if (Number.isNaN(input)) {
          return "";
      }
      const output = convert(input);
      const rounded = Math.round(output * 1000) / 1000;
      return rounded.toString();
  }
  
  class App extends React.Component {
      constructor(props) {
          super(props);
          this.handleCelsiusChange = this.handleCelsiusChange.bind(this);
          this.handleFahrenheitChange = this.handleFahrenheitChange.bind(this);
          this.state = {
              temperature: "",
              scale: "c"
          };
      }
  
      handleCelsiusChange(temperature) {
          this.setState({
              scale: "c",
              temperature
          });
      }
  
      handleFahrenheitChange(temperature) {
          this.setState({
              scale: "f",
              temperature
          });
      }
  
      render() {
          const scale = this.state.scale;
          const temperature = this.state.temperature;
          const celsius =
              scale === "f" ? tryConvert(temperature, toCelsius) : temperature;
          const fahrenheit =
              scale === "c" ? tryConvert(temperature, toFahrenheit) : temperature;
  
          return (
              <div>
                  <TemperatureInput
                      scale="c"
                      temperature={celsius}
                      onTemperatureChange={this.handleCelsiusChange}
                  />
                  <TemperatureInput
                      scale="f"
                      temperature={fahrenheit}
                      onTemperatureChange={this.handleFahrenheitChange}
                  />
              </div>
          );
      }
  }
  
  export default App;
  