Exercises

• Write your own interface and use it in another Go program. Then state why your interface is useful.
• Write an interface for calculating the volume of shapes with three dimensions, such as cubes and spheres.
• Write an interface for calculating the length of line segments and the distance between two points in the plane.
• Explore reflection using your own example.
• How does reflection work on Go maps?
• If you are good at mathematics, try to write an interface that implements the four basic mathematical operations for both real numbers and complex numbers. Do not use the complex64 and complex128 standard Go types – define your own structure for supporting complex numbers.