如何知道二进制整数是否代表负数? [英] How to know if a binary integral number represents a negative number?

问题描述

我正在阅读一些C文本.在负值和正值"会话中，作者提到了几种以二进制形式表示负数的方法.

I am reading some C text. In the Negative and Positive Values session, the author mentioned several ways of representing a negative number in binary form.

我完全理解了，并且想知道是否给定二进制数，我们是否可以确定它是否为负?

I understood all of the way and was wondering if with a give binary number, can we determine if it is negative?

例如，-92具有8位二进制形式:10100100.但是，如果给我们10100100，我们可以说它是-92，而不是其他非负数吗?

For example, the -92 has the 8-bit binary form: 10100100. But if we are given 10100100 can we say that is -92, and not other non-negative number?

推荐答案

当然，这取决于表示形式.在广泛使用的二进制补码中，您只需查看最高有效位.

It depends on the representation, of course. In two's complement, which is widely used, you simply look at the most significant bit.

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