The decimal representation is −2147483648, converted to binary: 10000000000000000000000000000000
。
first place 1
It is both a sign bit and a value bit: −231=2,147,483,648
Because the sign bit is also counted as a value bit at the same time, the minimum value that can be taken is -2^31
。
The decimal representation is 2147483647
, converted to binary: 011111111111111111111111111111
。
2147483647=230+229+228+...+23+22+21+20
。
Because even if the sign bit is 0, the value bit is also 0, so the maximum value that can be obtained is (2^31) -1
[Note: The absolute value of the minimum value (negative number) in INT_32 is 1 greater than the absolute value of the maximum value (positive number) . 】
The range of float and double is determined by the number of digits in the exponent. References: