Basic Computer Notions Software

Next A simple computer Instruction format Instruction format (cont'd) Machine instructions Machine instructions (cont'd) Machine instructions (cont'd) Machine instructions (cont'd) Machine instructions (cont'd) Machine-language Programming Machine-language Programming (cont'd) Machine-language Programming (cont'd) Machine-language Programming (cont'd) Machine-language Programming (cont'd) Machine-language Programming (cont'd) Machine-language Programming (cont'd) Machine-language Programming (cont'd) Machine-language Programming (cont'd) Machine-language Programming (cont'd) Machine-language Programming (cont'd) Machine-language Programming (cont'd) Machine-language Programming (cont'd) Machine-language Programming (cont'd) Machine-language Programming (cont'd) Machine-language Programming (cont'd) Machine-language Programming (cont'd) Machine-language Programming (cont'd) Machine-language Programming (cont'd) Machine-language Programming (cont'd) Machine-language Programming (cont'd) Machine-language Programming (cont'd) Sample data Using an ‘intelligent’ computer Using a not-so-intelligent computer Using an ‘English-like’ query system Using a highly interactive system Using a highly interactive system (cont'd) Using a highly interactive system (cont'd) Using a highly interactive system (cont'd) Using SQL (Structured Query Language) Using a report-generation language Using a general-purpose high-level programming language Using assembler language Compilers and interpreters Compilers and interpreters (cont'd) Types of software Operating systems Operating systems are very complex Operating systems need to be very robust 49 of 50 Consequences (cont'd)

Consequences

1991 Feb: 28 killed, 97 injured when Patriot missile-defence system failed.
Cause: software bug.
M Grottke & KS Trivedi, ‘Fighting bugs: Remove, retry, replicate, and rejuvenate’, Computer 2007, 40(2): 107-109)

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