Presentation1 c o-mprog
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Computer programming involves designing, writing, testing, debugging, and maintaining source code to create programs that exhibit desired behaviors. Programming languages are used to write source code, with programming tracing back to ancient mechanical devices. The process requires expertise in many domains, from application knowledge to algorithms. Efficiency, reliability, robustness, usability, portability, and maintainability are important characteristics for evaluating programs.
Presentation1 c o-mprog
- 7. Computer Programming (often shortened to programming or coding ) is the process of designing, writing, testing, debugging / troubleshooting, and maintaining the source code of computer programs.
- 8. This source code is written in a programming language.
- 10. The purpose of programming is to create a program that exhibits a certain desired behavior (customization).
- 11. What the... computer? programming?
- 12. The process of writing source code often requires expertise in many different subjects, including knowledge of the application domain, specialized algorithms and formal logic.
- 13. Within software engineering, programming (the implementation ) is regarded as one phase in a software development process.
- 14. Programming is the craft of transforming requirements into something that a computer can execute.
- 15. The concept of devices that operate following a pre-defined set of instructions traces back to Greek Mythology, notably Hephaestus , the Greek Blacksmith God, and his mechanical slaves.
- 16. The Antikythera mechanism from ancient Greece was a calculator utilizing gears of various sizes and configuration to determine its operation.
- 17. Al-Jazari built programmable Automata in 1206. One system employed in these devices was the use of pegs and cams placed into a wooden drum at specific locations.
- 18. The Jacquard’s Loom , which Joseph Marie Jacquard developed in 1801, uses a series of pasteboard cards with holes punched in them. The hole pattern represented the pattern that the loom had to follow in weaving cloth. The loom could produce entirely different weaves using different sets of cards.
- 19. Charles Babbage adopted the use of punched cards around 1830 to control his Analytical Engine .
- 20. In the late 1880s, Herman Hollerith invented the recording of data on a medium that could then be read by a machine. To process these punched cards, first known as "Hollerith cards" he invented the tabulator, and the keypunch machines. In 1896 he founded the Tabulating Machine Company (which later became the core of IBM).
- 21. The invention of the von Neumann architecture allowed computer programs to be stored in computer memory. In 1954, FORTRAN was invented; it was the first high level programming language to have a functional implementation, as opposed to just a design on paper. the name FORTRAN stands for "Formula Translation“.
- 22. Many other languages were developed, including some for commercial programming, such as COBOL . (COmmon Business-Oriented Language.) By the late 1960s, data storage devices and computer terminals became inexpensive enough that programs could be created by typing directly into the computers. Text editors were developed that allowed changes and corrections to be made much more easily than with punched cards.
- 23. Throughout the second half of the twentieth century, programming was an attractive career in most developed countries. Some forms of programming have been increasingly subject to offshore outsourcing . It is unclear how far this trend will continue and how deeply it will impact programmer wages and opportunities.
- 24. Efficiency / performance : the amount of system resources a program consumes (processor time, memory space, slow devices such as disks, network bandwidth and to some extent even user interaction): the less, the better.
- 25. Reliability : how often the results of a program are correct. This depends on conceptual correctness of algorithms, and minimization of programming mistakes, such as mistakes in resource management and logic errors.
- 26. Robustness : how well a program anticipates problems not due to programmer error. This includes situations such as incorrect, inappropriate or corrupt data, unavailability of needed resources such as memory, operating system services and network connections, and user error.
- 27. Usability : the ergonomics of a program: the ease with which a person can use the program for its intended purpose, or in some cases even unanticipated purposes. This involves a wide range of textual, graphical and sometimes hardware elements that improve the clarity, intuitiveness, cohesiveness and completeness of a program's user interface.
- 28. Portability : the range of computer hardware and operating system platforms on which the source code of a program can be compiled/interpreted and run.
- 29. Maintainability : the ease with which a program can be modified by its present or future developers in order to make improvements or customizations, fix bugs and security holes , or adapt it to new environments.
- 30. Hephaestus is the god of the smiths. He discovered the ways of working iron, copper, gold, silver, and everything else which requires fire for working. Hephaestus is called son of Zeus and Hera .