with this class you ll be able to perform the most usual operations on rational numbers( +, -, *, /.. ),but also there are some suplementary features like the \"exponential function\", \"logarithm function\" etc. So,check it out!

shannon编码.cpp Shannon编码采用了先对概率分布排序后，再进行取码长，码长的选取方式是对概率累和取以2为底的对数形式。这种编码具有一定的局限性，当概率很接近时，码长会去到相等的长度。-shannon coding. cpp Shannon coding uses the first order of probability distribution, after taking further code length, code length selection method is

两边取常用对数，即可算出log10(N!),向上取整即为N!的位数 -Take the common logarithm of both sides, can be calculated log10 (N!), rounding up is N! Digits

输入表达式字符串，以“=”表示结束， 计算并输出表达式值。 操作数可以是整数或实数，操作符有 “+”、“-”、“*”、“/”、“^”（乘方）和 “sin( )”（正弦）、“cos( )”（余弦）、“log( )”（对数）、“ln( )”（自然对数）等函数。-Enter the expression string to " =" indicates the end of the calculation and the output value of the expression.