input: Write a function to convert the given temperature from Celsius to Fahrenheit. The function should take a single argument representing the temperature in Celsius and return the equivalent temperature in Fahrenheit.
  
  
  def celsius_to_fahrenheit(celsius):
      fahrenheit = (celsius * 9/5) + 32
      return fahrenheit
  
  assert celsius_to_fahrenheit(0) == 32.0
  assert celsius_to_fahrenheit(100) == 212.0
  assert celsius_to_fahrenheit(-20) == -4.0
  
output: def celsius_to_fahrenheit(celsius):
      fahrenheit = (celsius * 9/5) + 32
      return fahrenheit