计算机在作定点乘法或浮点乘法和加法时，会使字长增加。如原是ｂ位字长，运算后增长到ｂｉ位字长，这就要对尾数作量化处理，使ｂｉ位字长缩减为ｂ位字长。截尾处理就是保留ｂ位码而抛掉余下的尾数，舍入处理就是按最接近的值取ｂ位码。这两种处理所产生的误差是不一样的... When making a dotted or floating-point multiply and add, the computer increases the word size. If the original b-bit word length, after the operation grows to the word bit length of bi, it is necessary to quantify the mantissa, so that the word bit bi bit reduced to b-bit word length. Censoring is to retain the b-bit code and throw away the remaining mantissa, rounding is to take the nearest value of b-bit code. The errors produced by these two processes are not the same ...