因为它是
bitwise operator.我认为这意味着4乘以2 ^ 5,因为该运算符意味着
Shift the bits of $a $b steps to the left (each step means “multiply
by two”)
所以这是五个步骤.这是4 * 2 * 2 * 2 * 2 * 2(但我在这里猜测;一切都发生在比特级别).