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1から100までの間で、3の倍数の数だけを足した合計値を表示

JavaScript

Posted at 2018-11-29

<!DOCTYPE html>
<html lang="ja">
<head>
   <meta charset="UTF-8">
   <title>1から100までの間で、3の倍数の数だけを足した合計値</title>
</head>
<body>
<script>
    var sum = 0; //初期値0
    for (var i = 1; i <= 100; i++) {
        if (i%3 === 0) {
        sum = sum + i ; //sum += i でもOK
        }
    }
    document.write(sum);
</script>
</body>
</html>

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