Add Two Numbers in React Js

<!DOCTYPE html>
<html>
  <head>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.14.0/umd/react.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.14.0/umd/react-dom.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js"></script>
  </head>
  <body>
    <div id="app"></div>
    <script type="text/babel">
      const { useState} = React;

function App() {
        const [num1, setNum1] = useState(10);
        const [num2, setNum2] = useState(23);
        const [result, setResult] = useState(0);

const handleNum1Change = (event) => {
          setNum1(Number(event.target.value));
        };

const handleNum2Change = (event) => {
          setNum2(Number(event.target.value));
        };

const handleAddition = () => {
          setResult(num1 + num2);
        };

return (
          <div className="container">
            <h3 className="title">React Js Add Two Numbers</h3>
            <input
              type="number"
              className="input"
              value={num1}
              onChange={handleNum1Change}
            />
            <input
              type="number"
              className="input"
              value={num2}
              onChange={handleNum2Change}
            />
            <button className="button" onClick={handleAddition}>
              Add
            </button>
            <p className="result">Result: {result}</p>
          </div>
        );
      }

ReactDOM.render(<App />, document.getElementById("app"));
    </script>
    <style>
      .container {
        margin: 0 auto;
        width: 500px;
        text-align: center;
        box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12),
          0 2px 4px 0 rgba(0, 0, 0, 0.24);
        padding: 20px;
        display: flex;
        flex-direction: column;
        align-items: center;
      }

.title {
        font-size: 24px;
        margin-bottom: 20px;
      }

.input {
        width: 200px;
        padding: 10px;
        margin-bottom: 10px;
      }

.button {
        padding: 10px 20px;
        background-color: #007bff;
        color: #fff;
        border: none;
        border-radius: 4px;
        cursor: pointer;
      }

.result {
        margin-top: 20px;
      }
    </style>
  </body>
</html>

 
<!DOCTYPE html>
<html>
  <head>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.14.0/umd/react.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.14.0/umd/react-dom.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js"></script>
  </head>
  <body>
    <div id="app"></div>
    <script type="text/babel">
      const { useState} = React;
​
      function App() {
        const [num1, setNum1] = useState(10);
        const [num2, setNum2] = useState(23);
        const [result, setResult] = useState(0);
​
        const handleNum1Change = (event) => {
          setNum1(Number(event.target.value));
        };
​
        const handleNum2Change = (event) => {
          setNum2(Number(event.target.value));
        };
​
        const handleAddition = () => {
          setResult(num1 + num2);
        };
​
        return (
          <div className="container">
            <h3 className="title">React Js Add Two Numbers</h3>
            <input
              type="number"
              className="input"
              value={num1}
              onChange={handleNum1Change}
            />
            <input
              type="number"
              className="input"
              value={num2}
              onChange={handleNum2Change}
            />
            <button className="button" onClick={handleAddition}>
              Add
            </button>
            <p className="result">Result: {result}</p>
          </div>
        );
      }
​
      ReactDOM.render(<App />, document.getElementById("app"));
    </script>
    <style>
      .container {
        margin: 0 auto;
        width: 500px;
        text-align: center;
        box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12),
          0 2px 4px 0 rgba(0, 0, 0, 0.24);
        padding: 20px;
        display: flex;
        flex-direction: column;
        align-items: center;
      }
​
      .title {
        font-size: 24px;
        margin-bottom: 20px;
      }
​
      .input {
        width: 200px;
        padding: 10px;
        margin-bottom: 10px;
      }
​
      .button {
        padding: 10px 20px;
        background-color: #007bff;
        color: #fff;
        border: none;
        border-radius: 4px;
        cursor: pointer;
      }
​
      .result {
        margin-top: 20px;
      }
    </style>
  </body>
</html>
​