Compound assignment (+=, -=, ++, --)
Also written: +=, -=, ++, --, increment
Short forms that change a variable based on its own value: `stamps += 2` means `stamps = stamps + 2`, and `stamps++` adds 1.
Also written: +=, -=, ++, --, increment
Short forms that change a variable based on its own value: `stamps += 2` means `stamps = stamps + 2`, and `stamps++` adds 1.