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来自「浙江大学计算机学院数据结构课程的教学课件」· HTM 代码 · 共 71 行
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<b>|</b><font face="宋体" size="2">第一章</font><b>|</b><font face="宋体" size="2"><a href="../text2/text2-0.htm">第二章</a></font><b>|</b><font face="宋体" size="2"><a href="../text3/text3-0.htm">第三章</a></font><b>|</b><font face="宋体" size="2"><a href="../text4/text4-0.htm">第四章</a></font><b>|</b><font face="宋体" size="2"><a href="../text5/text5-0.htm">第五章</a></font><b>|</b><font face="宋体" size="2"><a href="../text6/text6-0.htm">第六章</a></font><b>|</b><font face="宋体" size="2"><a href="../text7/text7-0.htm">第七章</a></font><b>|</b><font face="宋体" size="2"><a href="../text8/text8-0.htm">第八章</a></font><b>|</b><font face="宋体" size="2"><a href="../text9/text9-0.htm">第九章</a></font><b>|</b><font face="宋体" size="2"><a href="../text10/text10-0.htm">第十章</a></font><b>|</b><font size="2" face="宋体"><a href="../textA/textA-0.htm">算法分析</a><b><font color="#000000">|</font></b>
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<pre><font face="Arial, Helvetica, sans-serif" color="#000000" size="4"><b><font size="5" color="#FF0033">1.3 Data abstraction</font>
<font color="#0000FF">data type -</font>----- a collection of objects and a set operations that
act on those objects.
<font color="#0000FF">predefined data type :</font>
int 、char、 float 、double (short、long 、unsigned、 pointer)
array 、struct 、union 、enum
<font color="#CC0033">Abstract Data Type (ADT)</font>
<i> a data type that is organized in such a way that the specification
on the objects and specification of the operations on the objects
separated from the representation of the objects and the imple-
mentation on the operations</i>
----------------------------------------------------------------------------------------------
structure <i> <font color="#FF0033">natural_Number</font></i> is
<font color="#0000FF">objects: </font>an ordered subrange of the integers starting at
zero and ending at<font color="#0000FF"> </font> the maximum integer<font size="3">(INT_MAX)</font>
on the computer
<font color="#0000FF">functions:</font>
for all x,y <img src="image/Image4.gif" width="13" height="13"> Nat_Number, TRUE,FALSE <img src="image/Image4.gif" width="13" height="13"> Boolean
and where +,-,<,and== are the usual integer operations
<font color="#993399"> <i><font size="3">Nat_No Zero( ) </font></i></font><font size="3"> ::= 0<br>
<font color="#993399"> <i> Boolean Is_Zero(X)</i> </font> ::= If(x) return FALSE else return TRUE<br>
<font color="#993399"><i>Nat_No Add(x,y) </i></font> ::= If((x+y) <= INT_MAX) return x+y</font><font face="Arial, Helvetica, sans-serif" color="#000000" size="4"><b><font size="3"> else return INT_MAX</font></b></font><font size="3">
<i><font color="#993399">Boolean Equal(x,y)</font></i> ::= if (x==y) return TRUE</font><font face="Arial, Helvetica, sans-serif" color="#000000" size="4"><b><font size="3"> else return FALSE</font></b></font><font size="3">
<font color="#FF0066"> <font color="#993399"><i>Nat_No Successor(x)</i></font></font> ::= if(x == INT_MAX) return x</font><font face="Arial, Helvetica, sans-serif" color="#000000" size="4"><b><font size="3"> else return x+1</font></b></font><font size="3">
<font color="#FF0066"> <font color="#993399"><i>Nat_No subtract(x,y)</i> </font></font>::= if(x < y) return 0</font><font face="Arial, Helvetica, sans-serif" color="#000000" size="4"><b><font size="3"> else return x - y</font></b></font><font size="3">
</font>
end <font color="#FF0033"><i>Natural_Number</i></font>
------------------------------------------------------------------------------------------------
<font color="#FF66CC">operation specification</font>
the name of every function
the type of its arguments
the type of its result
<font color="#FF66CC"> function categories:</font>
(1) creator / constructor
(2) transformers
(3) observers / reporters
</b></font></pre>
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