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The names of the components of the calculating device were borrowed from the textile industry. In 1837, Charles Babbage was inspired by Jacquard's loom to attempt to build the Analytical Engine. At each stage in hardware's history, the task of computer programming changed dramatically.Īnalytical Engine Lovelace's description from Note G Improvements in software development are the result of improvements in computer hardware. See also: Computer programming § History, Programmer § History, History of computing, History of programming languages, and History of software Here is an example computer program, in Basic, to average a list of numbers:

Also, variables are automatically initialized to zero. For example, variables are not declared before being used. The syntax of the language BASIC (1964) was intentionally limited to make the language easy to learn. The 'Hello, World!' program is used to illustrate a language's basic syntax. Moreover, the interpreter must be installed on the computer.Įxample computer program 'Hello, World!' program by Brian Kernighan (1978) Running the source code is slower than running an executable. The interpreter then loads the source code into memory to translate and execute each statement. If the source code is requested for execution, then the operating system loads the corresponding interpreter into memory and starts a process. The central processing unit will soon switch to this process so it can fetch, decode, and then execute each machine instruction. If the executable is requested for execution, then the operating system loads it into memory and starts a process.

Alternatively, source code may execute within the language's interpreter. ( Assembly language programs are translated using an assembler.) The resulting file is called an executable. Therefore, source code may be translated to machine instructions using the language's compiler. Source code needs another computer program to execute because computers can only execute their native machine instructions. Ī computer program in its human-readable form is called source code. It is one component of software, which also includes documentation and other intangible components. Source code for a computer program written in the HTML and JavaScript languagesĪ computer program is a sequence or set of instructions in a programming language for a computer to execute. For the TV program, see The Computer Programme.

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