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Why does a java byte variable only hold a minimum value of -128 and a maximum value of 127. I dont get why only those range of 3 digits. Its just holding 3 characters really. Why not hold AB2?
Wiki User
∙ 12y ago
A byte is 8 binary bits, each of which hold a value of 0 or 1 (true or false). When counting in binary, a value of 11111111 is the highest value a byte can hold, this is 255. It doesn't matter what programming language is assigning a value to the byte, the highest it can hold is 255.
A 'signed' byte uses one bit for the sign, and 7 for the value. Hence 7 bits can show values of up to 128 either side. That's a positive value of 1-127, along with the 0, and then negative values of -1 to -128. Again, regardless of the system assigning the value, 8 bits can only produce 255 different combinations.
Wiki User
∙ 12y ago
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