【摘要】 几何对象的不精确以及计算机浮点运算生成的误差积累，势必会影响几何算法的可靠性。仅靠盲目提高各数据精度来确保几何算法可靠性的方法是不可取的。本文提出了一种根据所求的几何表示误差确定几何算法中计算精度的方法，人们可通过该方法选取适当的计算精度，从而避免了因对精度要求过高而做的多余工作。更多还原

【Abstract】 The reliability of geometric algorithm is reduced by two reasons which are presenting inaccuration and computer′s floating operation. The thought that promotes precision of every datum to assure algorithm′s reliability is meanless. According to presenting error to determine computer precision is a useful method. We can select proper precision in this way. So, too much work which is from too highly precision asked to reach is avoided.更多还原