No1=1 No2=2 1. let result=No1+No2   let No1++    let No1+=3 2. result=$[No1+No2] 3. result=$((No1+No2)) 4. result=`expr $No1 + $No2`   # '$' and space are necessary. 5. echo "$No1+No2"|bc echo "scale=3; 3/4"|bc      #keep three decimal…

An application binary interface includes linkage structures for interfacing a binary application program to a digital computer. A function in a relocatable shared object module obtains the absolute address of a Global Offset Table (GOT) in the module…

DDN(Digital Data Network,数字数据网)是一种利用光纤.数字微波或卫星等数字传输通道和数字交叉复用设备组成的数字数据传输网.它可以为用户提供各种速率的高质量数字专用电 数字数据网(ddn 数字数据网(ddn 路和其他新业务,以满足用户多媒体通信和组建中高速计算机通信网的需要. 数字数据网主要由六个部分组成:光纤或数字微波通信系统:智能节点或集线器设备:网络管理系统:数据电路终端设备:用户环路:用户端计算机或终端设备. 它的主要作用是向用户提供永久性和半永久性连接的数字数据传…

OpenCASCADE Curve Length Calculation eryar@163.com Abstract. The natural parametric equations of a curve are parametric equations that represent the curve in terms of a coordinate-independent parameter, generally arc length s, instead of an arbitray…

https://en.wikipedia.org/wiki/Secure_Digital#Technical_details Secure Digital (SD) is a non-volatile memory card format developed by the SD Card Association (SDA) for use in portable devices. The standard was introduced in August 1999 by joint effort…

mbed的IO操作非常灵活,常见的关于Digital IO操作整理如下表 ,其中蓝色字体是构造函数,绿色字体的是操作符重载,使用时只要创建对象,就可以调用对应的方法来操作,并且每种都提供了操作符重载,使用上更加灵活 DigitalIn DigitalIn (PinName pin) 构造函数,创建连接到指定Pin的DigitalIn对象 DigitalIn (PinName pin, PinMode mode) 构造函数,同上,指定了PinMode int read () 读Pin状态,返回0…

Background The digital root of a positive integer is found by summing the digits of the integer. If the resulting value is a single digit then that digit is the digital root. If the resulting value contains two or more digits, those digits are summed…

关于digital root可以参考维基百科,这里给出基本定义和性质. 一.定义 数字根(Digital Root)就是把一个数的各位数字相加,再将所得数的各位数字相加,直到所得数为一位数字为止.而这个一位数便是原来数字的数字根.适用范围为正整数和零.例如:65536,6+5+5+3+6=25,2+5=7,故数根为7. 二.性质 1. 任何数加减9的数字根还是它本身. 2. 9乘任何数字的数字根都是9. 3. 数字根的三则运算 (1). 两数之和的数字根等于这两个数的数字根的和数字根      …

advertising: n,广告 Online search giant Baidu Inc is set to loset its top spot in the nation's booming digital adversiting market this year to its rival Alibaba group Holding Ltd,accroding to a report form London-based market research firm eMarketer; I…

http://acm.hdu.edu.cn/showproblem.php?pid=4965 2014 Multi-University Training Contest 9 1006 Fast Matrix Calculation Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 238    Accepted Submission(…