取小数有些继续乘以2一向算到小数效果为0间断

根柢C言语的大块都提及了一些细节和用法暂时不再本模块介绍了希望我愿望可以在结业之前给我大学生方案上一个满足的句号。加油尽力。前面一篇我讲了位运算后。

本模块的第三篇就现已讲了根柢的数据类型，其间把浮点数成心留在后边来介绍。了解是了解了内存，指针，位运算等后，再来介绍浮点这个格外而又一般的数据类型比照好了解。浮点数和根柢类型数据的存储区别比照大，这儿不是说存储方法的区别，而是浮点数存放的时分是要经过运算后再转换成整数的4字节或8字节的方法，然后再存放到内存里。因此，只经过16进制数是看不进入和整数有啥不一样。一样，浮点数具体是如何存储的大学的课程上一般不会细细说明，一般是自个有喜好再查阅资料。

包括本篇的内容，假设你不是一个自学者或许布满好奇心，也不会看下去，也不会找到本篇的URL因此，包括很多现已工作很多年的次第员都不知道浮点数具体是如何运算然后存储的就我来讲，认为仍是非常有必要了解这个常用的数据类型的换算进程，尽管我自个来讲很难去打破其时浮点数的核算规矩以至于将他精度前进，但是解下底层工作者们辛苦，应当向他真诚的问候。由于有他便有了大树可以纳凉。

本篇的目的便是为了让更多的人了解浮点数存储的根柢原理，仍是那句话，学习的一同带着思考。一样这儿不评论浮点数的精度丢掉和数值的核算理论。直接讲实质的标明。核算机展开进程中，运用的小数和实数从前提出过很多种的标明方法。

典型的比方相对于浮点数的定点数（FixPointNumber这种表达方法中，小数点固定的位于实数全部数字基地的某个方位。钱银的表达就可以运用这种方法，比方 88.22或许 22.88可以用于表达具有四位精度（Precis小数点后有两位的钱银值。由于小数点方位固定，所以可以直接用四位数值来表达相应的数值。

SQL中的NUMBER数据类型便是运用定点数来定义的还有一种提议的表达方法为有理数表达方法，即用两个整数的比值来表达实数。 其间 1.23456为尾数。2 其间 1.23456为尾数。

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时间： 2024-10-23 08:25:03

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