Compound assignment operators are shorthand notations that combine an arithmetic operation with the assignment operator. They allow you to perform an operation and assign the result to a variable in a single step.
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This operator adds the value on the right side of it to the variable on the left side, and then assigns the result back to that variable.
-= operator: This operator subtracts the value on the right side of it from the variable on the left side, and then assigns the result back to that variable.