이진수의 부호 비트
Now we have two different ways of using binary numbers. Binary numbers can be either signed or unsigned. Unsigned 8-bit numbers range from 0 through 255. Signed 8-bit numbers range from –128 through 127. Nothing about the numbers themselves will tell you whether they're signed or unsigned. For example, suppose someone says, "I have an 8-bit binary number and the value is 10110110. What's the decimal equivalent?" You must first inquire, "Is that a signed or an unsigned number? It could be –74 or 182."