ex7.07

README

Exercise 7.7 (P181)

Explain why the help message contains °C when the default value of 20.0 does not.

Answer: The flag's value is a Stringer, and is used in command-line help messages. Celsius has a func (c Celsius) String() string method, so Celsius is a Stringer. When flag shows the help messages, it will call Celsius' String method to format the value.

Documentation

Overview

Tempflag prints the value of its -temp (temperature) flag.