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This is a convenient shorthand to perform subtraction of a constant or a variable from a variable.
x -= y; // equivalent to the expression x = x - y;x: variable. Allowed data types: int, float, double, byte, short, long
y: variable or constant. Allowed data types: int, float, double, byte, short, long
x = 20;
x -= 2; // x now contains 18LANGUAGE compound remainder
LANGUAGE compound bitwise and
LANGUAGE compound multiplication
LANGUAGE increment
LANGUAGE compound addition
LANGUAGE decrement
LANGUAGE compound division
LANGUAGE compound bitwise xor
LANGUAGE compound bitwise or
LANGUAGE Normal Subtraction
