在数据库系统中进行百位数学四则运算

Four Fundamental Operations of Mathematics with Hundred Bits in Database System

给出了几个ＦｏｘＰｒｏ中的函数（模块）。利用字符变量的特性，突破了系统中１８位数字型数据精度的限制，可进行百位加、减、乘、除运算，扩展了数据库系统的计算能力。本文利用这几个函数在ＦｏｘＰｒｏ中较好地改进了Ｂｅｒｎｏｕｌｌｉ数的计算结果。

In this paper, based on the specialities of character variables, the authors introduce several func- tions in FoxPro, which break through the restrictions of 18-bit numerical precision, and can be used to pro- cess addition, substraction, multiplication and division with hundred bits, and expand the ability of calcula- tion in database system. By means of these functions, the authors improve the known calculating result about Bernoulli number in FoxPro.