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 41 of 50 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)

Using a general-purpose high-level programming language

REAL      RECORD(5),  AVERAGE, TOTAL, AGE, SEX, WEIGHT
BYTE      SEX
INTEGER   NUMBER
TOTAL = 0.
NUMBER = 0
OPEN(UNIT=UNIT1,NAME='DATAFILE',TYPE='OLD',READONLY)
REPEAT
  [ READ(UNIT1,*,END=IEND) RECORD; (4F10.0,5X,A4)
    IF(IEND) BREAK
    AGE = RECORD(2)
    SEX = RECORD(5)
    WEIGHT = RECORD(3)
    IF(AGE >= 18 .AND. SEX == 'F')
      [ TOTAL = TOTAL + WEIGHT
        NUMBER = NUMBER + 1
       ]
   ]
AVERAGE = TOTAL / NUMBER
PRINT *, AVERAGE; (' Average = ',F5.1)
END

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

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