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An augmented assignment operator reassigns a variable to a value that it computes—via addition, subtraction, multiplication, or division—from a combination of the variable's current value and an expression's value . The following diagram illustrates how an assignment that uses an augmented assignment operator differs from an ordinary assignment:
variable name = variable name operator expression
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*----------------*
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variable name operator= expression
For example, you can rewrite result = result * 2 as follows:
result *= 2
Even though this shorthand gives you a perfectly valid way to multiply and
reassign, you may choose to write result = result * 2, which you see
throughout this book, on the ground that result = result * 2 stands
out more clearly as a reassignment operation.