text: import React from "react";
  import calculate from "../logic/calculate";
  import "./App.css";
  import ButtonPanel from "./ButtonPanel";
  import Display from "./Display";
  
  class App extends React.Component {
    constructor(props) {
      super(props);
      this.state = {
        total: null,
        next: null,
        operation: null
      };
    }
  
    handleClick = buttonName => {
      this.setState(calculate(this.state, buttonName));
    };
  
    render() {
      return (
        <div className="component-app">
          Tacos
          <Display value={this.state.next || this.state.total || "0"} />
          <ButtonPanel clickHandler={this.handleClick} />
        </div>
      );
    }
  }
  export default App;
  