c-lang:複合代入演算子
*=
foo *= bar → foo = foo * bar
/=
foo /= bar → foo = foo / bar
%=
foo %= bar → foo = foo % bar
+=
foo += bar → foo = foo + bar
-=
foo -= bar → foo = foo - bar
<<=
foo <<= bar → foo = foo << bar
>>=
foo >>= bar → foo = foo >> bar
&=
foo &= bar → foo = foo & bar
|=
foo |= bar → foo = foo | bar
^=
foo ^= bar → foo = foo ^ bar