Final answer:
A good postcondition specifies the state of the program or its variables after the code has executed.
Step-by-step explanation:
A good postcondition to write for code is a statement that specifies the state of the program or its variables after the code has executed.
It helps to ensure that the desired behavior and outputs are achieved.
For example, if the code is a function that calculates the area of a rectangle, a good postcondition could be:
The area is a positive number.