vt.舍入(修整)
If the roundoff is not 0, the representation is inexact , and V is inexactly representable in the type T. 如果舍入不是0，则表示是不精确的，V在类型T中不能精确表示。
If the roundoff is 0, the representation is exact , and V is exactly representable in the type T. 如果舍入为0，则表示是精确的，V在类型T中可以精确表示。
The use of the nested multiplication reduces the data roundoff noise from the limited wordlength of the the arithmetic unit, and enhances the performance of the filter. 本文采用嵌套相乘可以降低由于计算单元有限精度所带来的舍入噪声，提高滤波器的整体性能。
According to the finite-wordlength characteristic, the errors, which are from quantization and multiplicative roundoff, and the effects on the performance of the pulse compression are analyzed. 该文从有限字长角度出发，分析了预处理中滤波器系数量化误差和相乘截取误差对方位向脉冲压缩性能的影响，并提出了降低误差的方法。
s: termination because of roundoff noise. 划分三角形缺少空间，所以终止。
