what does x-=2 mean?

Answer 1

it means x=x-2;

Answer 2

It actually a shorthand method of writing x = x - 2. It holds good with other arithmatical operators too.

Answer 3

Like Rohan Yadav said just subtract 2 from x and then reassign it to x so that the value of x becomes 2 less than what it was before. In a loop it will continue decreasing the value over each iteration until a condition is met and the loop is dropped out of.

Answer 4

Yes, it's the sort hand for. x = x-2
you can also use:
x += 2. for addition
x *= 2. for multiplication
x /= 2. for division
x ℅=2. for modulus
x **=2. for power x^2

Answer 5

is it a condition for a loop? If yes the loop will stop when x is 0.

Answer 6

x = x-2

Answer 7

+Rohan Yadav, does that mean that when the outputed number-x equals 2, the loop will stop?

Answer 8

It is same as x = x + 2