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HIROSE Yuuji
#!/usr/bin/env ruby
require 'cgi'
puts "Content-type: text/html; charset=utf-8\n\n"
c = CGI.new
x = c['foo']
print(<<~EOF)
<!DOCTYPE html>
<html lang="ja">
<body>
<head><title>YES</title></head>
<body>
<p>2x=#{2*x.to_i}</p>
<form action="./nibai.rb" method="POST">
<p><input name="foo">を2倍します.</p>
<p><input type="submit">
<input type="reset"></p>
</form>
</body>
</html>
EOF