What Does Carry Flag (C Flag) Mean?
A carry flag in computer science works with the arithmetic logic unit (ALU) of a computer’s central processing unit to handle arithmetic and bitwise logical operations on binary numbers. The carry flag is used when an operation changes the left-hand bit of the binary system. Some call this the most significant or “leftmost” bit.
Techopedia Explains Carry Flag (C Flag)
The way the carry flag works is based on how addition and subtraction happens with binary numbers. Changes to the leftmost bit indicate a kind of turnover of a binary number set. For instance, when a binary sequence of 1111 gets 0001 added to it, and becomes 0000, the carry flag is turned on. Likewise, when 0000 gets 0001 subtracted, the result is 1111, and the carry flag gets turned on.
