1.symbols 主要在表间传递信息,作用于一个page中,类似于局部变量 SaveRecordInDatabase name date =key? Bob today bobKey Bill later billKey 在方法名前加=表示要把结果存储在symbol中,而不是跟方法的返回结果作比较 FetchRecordsFromDatabase key= fetch() name date billKey true Bill later bobKey true Bob today 在入参的列…
ref:http://www.coranac.com/tonc/text/asm.htm 23.1. Introduction Very broadly speaking, you can divide programming languages into 4 classes. At the lowest level is machine code: raw numbers that the CPU decodes into instructions to execute. One step u…
3.4. VariablesIn Java, every variable has a type. You declare a variable by placing the type first, followed by the name of the variable. Here are some examples: double salary; int vacationDays; long earthPopulation; boolean done; Notice the semicolo…
墙外通道:http://thinkiii.blogspot.com/2014/05/a-brief-introduction-to-per-cpu.html per-cpu variables are widely used in Linux kernel such as per-cpu counters, per-cpu cache. The advantages of per-cpu variables are obvious: for a per-cpu data, we do not n…
枚举部分 Enumeration part 使用枚举我们可以定义一些有名字的数字常量. 枚举通过 enum关键字来定义. Using enumerations, we can define some numeric constants with names. Enumeration is defined by the enum keyword. enum Direction { Up = 1, Down, Left, Right } 枚举是在运行时真正存在的一个对象,其中一个原因是因为这样可以从…
原地址 http://stackoverflow.com/questions/11662084/why-does-clojure-distinguish-between-symbols-and-vars?rq=1 Symbols are names Unlike most programming languages, Clojure makes a distinction between things and the names of things. In most languages, if…
Getting Started compile C++ program source $ g++ -o prog grog1.cc run C++ program $ ./prog The library, iostream, define four IO object: cin, cout, cerr, clog. std::cout << "hello world" << std::endl; The result of the output operato…
