Why this code give -91value

Question

int Y=26789;
byte b=(byte) Y;
System.out.println(b);

Answer 1

Cause byte is 8 bit and only has 256 values and 26789%256=165. But 8 bit represent the range of -128 to 127 so you need to calc 165 - 256 = -91

Answer 2

Byte in Java is in 2nd-complement. In binary 165 is 10100101. Cause the most significant bit is 1 it is a negative number. To get the absolute value you need to switch every bit and add 1: 01011010 + 1 = 01011011 = 64 + 16 + 8 + 2+ 1= 91

Answer 3

Thank you 🙂🙂