内容简介：The first calculatorsSimultaneously with the abacuses, still during the pre-revolutionary years (1917), the logarithmic (slide) rulers were used in scientific circles, practically without change, since the XVII century. They were in service "serve smb. f
The first calculators
The first mechanical device used in Russia for computational purposes was theRussian abacus (schoty). This device became "the national calculator" and was used in cashier's offices down to the middle of the 90's. It is interesting to note that the textbook "Trade calculations" published in 1986 devotes a whole chapter to methods of calculation by using abacuses.
Simultaneously with the abacuses, still during the pre-revolutionary years (1917), the logarithmic (slide) rulers were used in scientific circles, practically without change, since the XVII century. They were in service "serve smb. faithfully" up to the appearance of calculators.
In an effort to automate the processing of calculations, the mankind begins to invent mechanical calculating devices. It is known that the Russian mathematician Chebyshev designed a calculator at the end of the XIX century, unfortunately the drawings were lost.
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用户故事与敏捷方法
Mike Cohn / 石永超、张博超 / 清华大学出版社 / 2010-4 / 39.00元
《用户故事与敏捷方法》详细介绍了用户故事与敏捷开发方法的结合，诠释了用户故事的重要价值，用户故事的实践过程，良好用户故事编写准则，如何搜集和整理用户故事，如何排列用户故事的优先级，进而澄清真正适合用户需求的、有价值的功能需求。 《用户故事与敏捷方法》对于软件开发人员、测试人员、需求分析师和管理者，具有实际的指导意义和重要的参考价值。一起来看看 《用户故事与敏捷方法》 这本书的介绍吧!
