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  • 《structs and interpretation of computer program》讀書筆記

    In general, we shall see that recursion is a very powerful technique for dealing
    with hierarchical, treelike objects.

    2008-01-03
    1.The general form of a procedure definition is
    (define (<name> <formal parameters>) <body>)
    2.The general form of a conditional expression is
    Structure and Interpretation of Computer Programs
    (cond (<p1> <e1>)
    (<p2> <e2>)
    (<pn> <en>))

    3.The general form of an if expression is
    (if <predicate> <consequent> <alternative>)

    4.(and <e1> ... <en>)
    The interpreter evaluates the expressions <e> one at a time, in left-to-right order. If any <e>
    evaluates to false, the value of the and expression is false, and the rest of the <e>'s are not
    evaluated. If all <e>'s evaluate to true values, the value of the and expression is the value of the
    last one.
    l  
    (or <e1> ... <en>)
    The interpreter evaluates the expressions <e> one at a time, in left-to-right order. If any <e>
    evaluates to a true value, that value is returned as the value of the or expression, and the rest of
    the <e>'s are not evaluated. If all <e>'s evaluate to false, the value of the or expression is false.
    l  
    (not <e>)
    The value of a not expression is true when the expression <e> evaluates to false, and false
    otherwise.
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  • 原文地址:https://www.cnblogs.com/anchenjie007/p/1018800.html
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