整的最大值 [英] max value of integer

问题描述

在C，整数（32位机）是32位的，它的取值范围为-32768至+32767。
在Java中，整数也是32位，但范围是从-2,147,483,648到2,147,483,647

In C, the integer(for 32 bit machine) is 32 bit and it ranges from -32768 to +32767. In Java, the integer is also 32 bits but range is from -2,147,483,648 to 2,147,483,647

我不理解的范围内是如何用Java不同，即使比特数是相同的。有人可以解释吗？

I do not understand how the range is different in Java,even though the number of bits is the same. Can someone explain me?

推荐答案

在 C 的语言本身并不确定某些数据类型的再presentation。它可以改变从机器到机器，在嵌入式系统的 INT 可以是16位宽，但通常是32位。

In C, the language itself does not determine the representation of certain datatypes. It can vary from machine to machine, on embedded systems the int can be 16 bit wide, though usually it is 32 bit.

唯一的要求是，短整型＆LT; = INT ＆LT; = 长INT 按大小。此外，还有就是建议 INT 应该重新present处理器的本机容量

The only requirement is that short int <= int <= long int by size. Also, there is a recommendation that int should represent the native capacity of the processor.

所有类型签名。在无符号修改，您可以使用最高位的值（否则它被保留为符号位）的一部分。

All types are signed. The unsigned modifier allows you to use the highest bit as part of the value (otherwise it is reserved for the sign bit).

下面是可能的值可能的数据类型的短表：

Here's a short table of the possible values for the possible data types:

          width                     minimum                         maximum
signed    8 bit                        -128                            +127
signed   16 bit                     -32 768                         +32 767
signed   32 bit              -2 147 483 648                  [phone]
signed   64 bit  -9 223 372 036 854 775 808      [phone] 775 807
unsigned  8 bit                           0                            +255
unsigned 16 bit                           0                         +65 535
unsigned 32 bit                           0                  [phone]
unsigned 64 bit                           0     [phone] 551 615

在的Java 的的的 Java语言规范决定了某些数据类型的再presentation。

In Java, the Java Language Specification determines the representation of the certain data types.

的顺序是：字节 8位，短 16位， INT 32位，长 64位。

The order is: byte 8 bits, short 16 bits, int 32 bits, long 64 bits.

        width                     minimum                         maximum
byte:   8 bit                        -128                            +127
short: 16 bit                     -32 768                         +32 767
int:   32 bit              -2 147 483 648                  [phone]
long:  64 bit  -9 223 372 036 854 775 808      [phone] 775 807

在Java中，所有类型的签署的，没有签名的版本。然而，位操作处理的数字，因为他们无符号（即正确处理所有位）。

In Java, all types are signed, there are no unsigned versions. However, bit manipulations treat the numbers as they were unsigned (that is, handling all bits correctly).

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