javascript-syntax/ch10.html at main · FlounderAround/javascript-syntax · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script>
      //변수식 선언
      var num = 100;
      //생성자 함수식 선언
      var num = new Number(100);

      //형변환
      var left = prompt('좌변');
      var right = prompt('우변');
      alert('결과: ' + (Number(left) + Number(right)));

      var kor = prompt('국어');
      var math = prompt('수학');
      var eng = prompt('영어');

      alert(
        '결과: ' + ((Number(kor) + Number(math) + Number(eng)) / 3).toFixed(2)
      );

      var pi = Math.PI;

      document.write('올림: ' + Math.ceil(pi) + '<br>');
      document.write('내림: ' + Math.floor(pi) + '<br>');
      document.write('반올림: ' + Math.round(pi) + '<br>');

      var random = Math.random();
      alert(random);

      var int = Math.floor(Math.random() * 9) + 1;
      alert(int);
    </script>
  </head>
  <body></body>
</html>