Compound assignment
Also written: +=, -=, *=
Short forms that change a variable using its own value: `cups += 5` means `cups = cups + 5`, and `-=` and `*=` work alike.
Also written: +=, -=, *=
Short forms that change a variable using its own value: `cups += 5` means `cups = cups + 5`, and `-=` and `*=` work alike.