text: from flask import Flask, url_for, render_template, request
  
  app = Flask(__name__)
  
  @app.route('/')
  def render_main():
      return render_template('home.html')
  
  @app.route('/ctof')
  def render_ctof():
      return render_template('ctof.html')
  
  @app.route('/ftoc')
  def render_ftoc():
      return render_template('ftoc.html')
  
  @app.route('/mtokm')
  def render_mtokm():
      return render_template('mtokm.html')
  
  @app.route('/ftoc_result')
  def render_ftoc_result():
      try:
          ftemp_result = float(request.args['fTemp'])
          ctemp_result = ftoc(ftemp_result)
          return render_template('ftoc_result.html', fTemp=ftemp_result, cTemp=ctemp_result)
      except ValueError:
          return "Sorry: something went wrong."
  
  @app.route('/ctof_result')
  def render_ctof_result():
      try:
          ctemp_result = float(request.args['cTemp'])
          ftemp_result = ctof(ctemp_result)
          return render_template('ctof_result.html', cTemp=ctemp_result, fTemp=ftemp_result)
      except ValueError:
          return "Sorry: something went wrong."
  
  @app.route('/mtokm_result')
  def render_mtokm_result():
      try:
          # You'll need some code here, and maybe some extra parameters in render_template below...
          return render_template('mtokm.html')
      except ValueError:
          return "Sorry: something went wrong."
  
  def ftoc(ftemp):
     return (ftemp-32.0)*(5.0/9.0)
  
  def ctof(ftemp):
     return -42.0 # replace with correct formula
  
  # You'll probably want a basic function here to convert miles to kilometers too...
  
  if __name__=="__main__":
      app.run(debug=False, port=54321)
  