Yeni pencere olarak açılan popup kodu

puts "Hello there, can you tell me your grade as an integer?"
grande = gets.to_i

# Validate input
while grande == 0
  puts 'Please enter a valid integer.'
  grande = gets.to_i
end

# Ensure the grade is within the valid range
while grande < 0 || grande > 100
  puts 'Please enter a number between 0 and 100.'
  grande = gets.to_i
end

# Determine the letter grade
letter_grade = if grande >= 90
                'AA'
              elsif grande >= 85
                'BA'
              elsif grande >= 80
                'BB'
              elsif grande >= 75
                'CB'
              elsif grande >= 70
                'CC'
              elsif grande >= 65
                'DC'
              elsif grande >= 60
                'DD'
              elsif grande >= 50
                'FD'
              else
                'FF'
              end

# Output the result
puts "Your grade is #{letter_grade}."