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) 14 of 50 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 Consequences Consequences (cont'd)

Machine-language Programming (cont'd)

An assignment statement becomes a combination of Get and Put ... 
        GET SCORE1
        ADD SCORE2
        PUT TOTAL
        ADD (-50)
        JUMPGT PASS
        GRADE = 'F'
        GOTO END
PASS:   GRADE = 'P'
END:    STOP
→ 
        GET SCORE1
        ADD SCORE2
        PUT TOTAL
        ADD (-50)
        JUMPGT PASS
        GET ('F')
        PUT GRADE
        GOTO END
PASS:   GRADE = 'P'
END:    STOP

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Last modified: Thu, 2007 Mar 15 08:35:42

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