取补线路可任意选通减法器的输出或补取线路的输出。
A complementing circuit 'selects either the subtracter output or the output of the complementing circuit.
Draw a UML diagram first编写和测试vector 2d定义加法，减法，数量积，输入和输出操作符一类，和两个二维向量的内积。
Write and test a class Vector2D to define operators for addition, subtraction, scalar product, input and output, and inner product of two 2d vectors.
减法器（230）计算加法器（250）的输出和加法器（250）的输出的量化值之间的差以便确定量化误差。
The subtracter (230) calculates the difference between the output of the adder (250) and the quantized value of the output of the adder (250) to determine the quantization error.
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