Seneca - Module A - Introduction Programming Computers...

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Unformatted text preview: Module A - Introduction Programming Computers Introduce the art of software development "The most likely way for the world to be destroyed, most experts agree, is by accident. That's where we come in. We're computer professionals. We cause accidents." Nathaniel Borenstein (1991). Accidents | Software Development | Hardware | Exercises Accidents In May 2004, the Royal Bank of Canada informed the public that some of its transactions had not been properly reflected in its client balances. The bank cited glitches in the transaction processing system of one of its computer programs as the cause. One month later, the bank reported that "as many as 10 million customers" had been affected and that a "relatively small number" of programming statements had introduced the problem. The bank faced a class-action suit for damages of $500 per customer and a possible loss of $165 million in service fees. RBC's Account Imbalance In July 2004, the Canadian Imperial Bank of Commerce reported that its computer system had been affected by glitches. The system had double dipped about 60,000 personal lines of credit. Canadian banks hit with computer glitches In June 1996, the European Space Agency Ariane 5 maiden rocket self-destructed after going out of control because of a software error. Ariane 5- European Space Agency In October 1992, the computer aided dispatch system of the London Ambulance Service started malfunctioning. In one case, the ambulance arrived 11 hours late at a stroke victim's house - 5 hours after the caller had made their own way to the hospital. London Ambulance Service To minimize such accidents, we build quality into the software that we develop. We design it for, amongst other features, Useability Correctness Maintainability o Understandability o Modifiability Portability We achieve quality through robust and user-friendly interfaces structured programming comprehensive testing internal documentation standards compliance Software Development Software development is applications oriented from the outset. The programs that we develop are simulations of solutions to stated problems. The development process includes problem analysis, algorithm design, program coding, program testing and program maintainance. This strip caricatures the outcomes of the process. A program is a set of instructions that computer hardware will execute. The instructions transform raw data (the input) into information and eventually into comprehensible results (the output). The hardware stores the data internally during this process. Hardware The hardware components of a modern computer include a central processing unit, a clock, primary memory and a set of devices. These components are interconnected by buses - an address bus, a data bus, and a control bus. The buses carry information between the hardware components....
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Seneca - Module A - Introduction Programming Computers...

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