input: Write a function to convert a given temperature from Celsius to Fahrenheit. The function should take a single parameter representing the temperature in Celsius and return the temperature in Fahrenheit. If the given temperature is a float, the function should handle it appropriately.
  
  assert celsius_to_fahrenheit(0) == 32.0
  assert celsius_to_fahrenheit(100) == 212.0
  assert celsius_to_fahrenheit(-40) == -40.0
  assert celsius_to_fahrenheit(25.5) == 77.9
  assert celsius_to_fahrenheit(-15.3) == 4.46
output: def celsius_to_fahrenheit(celsius):
      return (celsius * 9/5) + 32