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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 56 行
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<pre align="left"><b><font face="Arial" size="4">
<font size="5" color="#FF0033">2.6 The string abstract data type</font>
<font color="#FF0000" face="Arial, Helvetica, sans-serif">DEFINITION</font>
<font color="#FF0033">string </font> ～ have the form, S= s0,……, sn-1, where si are characters
taken from the character set of the programming
language. if n = 0, then S is an empty or null string.
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structure <font color="#FF0033"> String </font> is
<font color="#0033CC">objects:</font> a finite set of zero or more characters.
<font color="#0033CC">functions:</font>
for all s, t <img src="image/Image4.gif" width="13" height="13"> String, i, j, m <img src="image/Image4.gif" width="13" height="13"> non-negative integers
<font color="#FF0099">String Null(m)</font> ::= return a string whose maximum length
is m characters, but is initially set to
<font size="3"><i>NULL</i></font> we write <font size="3"><i>NULL</i></font> as ""
<font color="#FF0099"> Integer Compare(s,t )</font> ::= if s equals t return 0
else if s precedes t return -1
else return +1
<font color="#FF0099">Boolean IsNull( s )</font> ::= if ( compare( s, <font size="3"><i>NULL</i></font>)) return <font size="3">FALSE</font>
else return <font size="3">TRUE</font>
<font color="#FF0099">INTEGER Length (s) </font>::= if (COMPARE (s, <font size="3"><i>NULL</i></font>))
return the number of characters in s
else return 0
<font color="#FF0099">String Concat (s, t )</font> ::= if ( COMPARE (t, <font size="3"><i>NULL</i></font>))
return a string whose elements are
those of s followed by those of t
else return s.
<font color="#FF0099">String Substr (s, i, j ) </font>::= if ((j > 0 )&& (i + j -1 ) < length(s))
return the string containing the chara-
cters of s at the position<font size="2"><i> i, i+1, … , i + j -1.</i></font>
else return NULL
end<font color="#FF0033"> String</font>
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