1. 签名幅度法：
在有符号幅度方法中，数字分为两部分：符号位和幅度。符号位为 1 表示负数，0 表示正数。数字的大小用数字的二进制形式表示。
示例：让我们以 8 位寄存器为例。
2. 2的补码方法：
在 2 的补码方法中，正数的表示方式与它们在符号幅度方法中的表示方式相同。但如果数字为负数，则先用正号表示该数字，然后取该数字的 2 的补码。
示例：让我们以 8 位寄存器为例。
Signed Magnitude 和 2’s Complement Method 的区别：
| SIGNED MAGNITUDE METHOD | 2’s COMPLEMENT METHOD |
|---|---|
| It is a method to denote fixed point signed numbers. | It is also used to denote fixed point signed numbers. |
| Number is divided into two parts. | Number is considered as a whole. |
| Sign bit is considered explicitly. | Sign bit is not considered explicitly. |
| Additional hardware is required for resultant sign of arithmetic. | No additional hardware is required in 2’s complement method. |
| Addition and subtraction are performed on separate hardware. | Addition and subtraction are performed by using adder only. |
| It has two different representation for 0. One is +0 and second is -0. (+0 : 0000 0000) & (-0 : 1000 0000) | 0 has only one representation for -0 and +0 (+0 or -0 : 0000 0000). |
| It is non-weighted system. | It assigns negative weight to the sign bit. |