Relationships among classes

CS Basics / Reading Notes

2020.01.02

Relationships among classes

Relations among different classes might be clear for me, however, the way using unified modeling language (UML) to represent it is something new to me. A note on this topic is worth taking to make it on my dictionary. Taken from Core Java Volume I (11th edition) - Cay S. Horstmann.

定点数与浮点数

CS Basics

2017.01.17

定点数与浮点数

定点数表达法的缺点在于其形式过于僵硬,固定的小数点位置决定了固定位数的整数部分和小数部分,不利于同时表达特别大的数或者特别小的数。最终,绝大多数现代的计算机系统采纳了所谓的浮点数表达方式。这种表达方式利用科学计数法来表达实数,即用一个尾数(Mantissa),一个基数(Base),一个指数(Exponent)以及一个表示正负的符号来表达大范围的实数。

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