if then if then e1 else e2 endif else e2 endif by keegan-mcdowell 109 slideshows follow user 66...
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DESCRIPTION
1. 假設以下的敘述為一未提供“捷徑計算”能力的程式段，試用程式設計的技巧，使此敘述經此改寫的動作後，具有與“捷徑計算”之處理方法相同之處理模式。 if and then E1 else E2 endif. if then if then E1 else E2 endif else E2 endif. (1) 寫出兩種布耳表式 (boolean expression) 之 AND 與 OR 兩運算子 (operator) 運算方式並比較兩方法之主要優缺點。 - PowerPoint PPT PresentationTRANSCRIPT
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if and then E1 else E2 endif
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if then if then E1 else E2 endifelse E2endif
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(1)(boolean expression)ANDOR(operator)(2)ADACPascal
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(1)a.(short circuit evaluation) (a)A and B AfalseA and Bfalse(b)A or B AtrueA or Btrueb.(complete circuit evaluation) (a)A and B AfalseBfalse(b)A or B AtrueBtruec.
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(2)a.ADAandorand thenor elseb.Cc.Pascal
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C(optimization compiler)(boolean operator)(sub-expression)
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C
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(recursive call)
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SNOBOLAPLLISPPascalFORTRANCOBOL
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(1)FORTRANPascalCOBOL(2)SNOBOLAPLLISPPascal
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(1)(static type binding)(dynamic type binding)(2)FortranPascalLispAPLSmalltalk
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(1)FortranPascal(2)LispAPLSmalltalk
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(variable)5-tupletuples
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(1)name(2)scope(3)type(4)l-value(5)r-value
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1.(attribute)(binding)(A)(dynamic binding) (B)(static binding) (C)(early binding) (D)(random binding)
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2.(Attribute)(binding)(A)(dynamic binding) (B)(static binding) (C)(early binding) (D)(random binding)
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3.(variables) (A)(name) (B)(value) (C)(error message) (D)(attribute)
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4.(data binding)(compile time)(A)LISP (B)PROLOG (C)Pascal (D)APL
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5. (A)APL (B)BASIC (C)C (D)PL/16.(dynamic binding type) : LispSchemeC++Java(A)1 (B)2 (C)3 (D)4
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7.(array)(heap dynamic)(A)FORTRAN 77 (B)Pascal (C)Ada (D)FORTRAN 9O8.APLL1,2,3,4,5,6L38(storage binding)(A)(static) (B)(static dynamic) (C)(explicit-dynamic variable) (D)(implicit-dynamic variable)
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9.(static binding type)ADACFORTRANAPL (A)1 (B)2 (C)3 (D)4 10.(expression)(type checking)(coercion)(A)ADA (B)C (C)C++ (D)FORTRAN