獲取Java中位數的值范圍

Question

我需要計算一些位數的有符號值范圍。
例如：

bitscount = 4

min value = -2^3;

max value = 2^3 - 1; in bitwise it is (1<<3 - 1)

我忘了如何按位組成最小值。 請幫忙。

Answer 1

minValue = -(1 << (bitscount - 1));
maxValue = (1 << (bitscount - 1)) - 1;

Answer 2

嘗試這樣：

 int bits_count = 4; // between 2 ~ 32 (I assumed int type is 32bits signed integer) int min_value = -(1 << (bits_count - 1)); int max_value = (1 << (bits_count - 1)) - 1; 

和參考站點： http : //www.tutorialspoint.com/java/java_bitwise_operators_examples.htm