What does the /= operator in C# do?

Question

What does the /= operator in C# do and when is it used?

Answer 1

It's divide-and-assign. x /= n is logically equivalent to x = x / n.

Answer 2

It is similar to +=, -= or *=. It's a shortcut for a mathematical division operation with an assignment. Instead of doing

x = x / 10;

You can get the same result by doing

x /= 10;

It assigns the result to the original variable after the operation has taken place.

Answer 3

In most languages inspired by C, the answer is: divide and assign. That is:

a /= b;

is a short-hand for:

a = a / b;

The LHS (a in my example) is evaluated once. This matters when the LHS is complex, such as an element from an array of structures:

x[i].pqr /= 3;