This is a convenient shorthand to perform division of a variable with another constant or variable.
x /= y; // equivalent to the expression x = x / y;
x: variable. Allowed data types: int, float, double, byte, short, long.y: non zero variable or constant. Allowed data types: int, float, double, byte, short, long. x = 2;
x /= 2; // x now contains 1