File: RM-3-6-3.html

package info (click to toggle)
ada-reference-manual 20021112web-3
  • links: PTS
  • area: main
  • in suites: etch, etch-m68k, lenny, sarge
  • size: 18,652 kB
  • ctags: 8,921
  • sloc: makefile: 52; sh: 20
file content (105 lines) | stat: -rw-r--r-- 9,881 bytes parent folder | download 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<HTML>
<HEAD>
    <TITLE>Ada95 - String Types</TITLE>
    <META NAME="Author" CONTENT="JTC1/SC22/WG9/ARG, by Randall Brukardt, ARG Editor">
    <META NAME="GENERATOR" CONTENT="Arm_Form.Exe, Ada Reference Manual generator">
    <STYLE type="text/css">
    DIV.paranum {position: absolute; font-family: Arial, Helvetica, sans-serif; left: 0.5 em; top: auto}
    TT {font-family: "Courier New", monospace}
    DT {display: compact}
    DIV.Normal {font-family: "Times New Roman", Times, serif; margin-bottom: 0.6em}
    DIV.Wide {font-family: "Times New Roman", Times, serif; margin-top: 0.6em; margin-bottom: 0.6em}
    DIV.Annotations {font-family: "Times New Roman", Times, serif; margin-left: 4.0em; margin-bottom: 0.6em}
    DIV.WideAnnotations {font-family: "Times New Roman", Times, serif; margin-left: 4.0em; margin-top: 0.6em; margin-bottom: 0.6em}
    DIV.Index {font-family: "Times New Roman", Times, serif}
    DIV.SyntaxSummary {font-family: "Times New Roman", Times, serif; margin-left: 2.0em; margin-bottom: 0.4em}
    DIV.Notes {font-family: "Times New Roman", Times, serif; margin-left: 2.0em; margin-bottom: 0.6em}
    DIV.NotesHeader {font-family: "Times New Roman", Times, serif; margin-left: 2.0em}
    DIV.SyntaxIndented {font-family: "Times New Roman", Times, serif; margin-left: 2.0em; margin-bottom: 0.4em}
    DIV.Indented {font-family: "Times New Roman", Times, serif; margin-left: 6.0em; margin-bottom: 0.6em}
    DIV.CodeIndented {font-family: "Times New Roman", Times, serif; margin-left: 4.0em; margin-bottom: 0.6em}
    DIV.SmallIndented {font-family: "Times New Roman", Times, serif; margin-left:  10.0em; margin-bottom: 0.6em}
    DIV.SmallCodeIndented {font-family: "Times New Roman", Times, serif; margin-left: 8.0em; margin-bottom: 0.6em}
    DIV.Examples {font-family: "Courier New", monospace; margin-left: 2.0em; margin-bottom: 0.6em}
    DIV.SmallExamples {font-family: "Courier New", monospace; font-size: 80%; margin-left: 7.5em; margin-bottom: 0.6em}
    DIV.IndentedExamples {font-family: "Courier New", monospace; margin-left: 8.0em; margin-bottom: 0.6em}
    DIV.SmallIndentedExamples {font-family: "Courier New", monospace; font-size: 80%; margin-left:  15.0em; margin-bottom: 0.6em}
    UL.Bulleted {font-family: "Times New Roman", Times, serif; margin-left: 2.0em; margin-right: 2.0em; margin-top: 0em; margin-bottom: 0.5em}
    UL.SmallBulleted {font-family: "Times New Roman", Times, serif; margin-left: 6.0em; margin-right: 6.0em; margin-top: 0em; margin-bottom: 0.5em}
    UL.NestedBulleted {font-family: "Times New Roman", Times, serif; margin-left: 4.0em; margin-right: 4.0em; margin-top: 0em; margin-bottom: 0.5em}
    UL.SmallNestedBulleted {font-family: "Times New Roman", Times, serif; margin-left: 8.0em; margin-right: 8.0em; margin-top: 0em; margin-bottom: 0.5em}
    UL.IndentedBulleted {font-family: "Times New Roman", Times, serif; margin-left: 8.0em; margin-right: 8.0em; margin-top: 0em; margin-bottom: 0.5em}
    UL.CodeIndentedBulleted {font-family: "Times New Roman", Times, serif; margin-left: 6.0em; margin-right: 6.0em; margin-top: 0em; margin-bottom: 0.5em}
    UL.CodeIndentedNestedBulleted {font-family: "Times New Roman", Times, serif; margin-left: 8.0em; margin-right: 8.0em; margin-top: 0em; margin-bottom: 0.5em}
    UL.SyntaxIndentedBulleted {font-family: "Times New Roman", Times, serif; margin-left: 4.0em; margin-right: 4.0em; margin-top: 0em; margin-bottom: 0.5em}
    UL.NotesBulleted {font-family: "Times New Roman", Times, serif; margin-left: 4.0em; margin-right: 4.0em; margin-top: 0em; margin-bottom: 0.5em}
    UL.NotesNestedBulleted {font-family: "Times New Roman", Times, serif; margin-left: 6.0em; margin-right: 6.0em; margin-top: 0em; margin-bottom: 0.5em}
    DL.Hanging {font-family: "Times New Roman", Times, serif; margin-top: 0em; margin-bottom: 0.6em}
    DD.Hanging {margin-left: 6.0em}
    DL.IndentedHanging {font-family: "Times New Roman", Times, serif; margin-left: 4.0em; margin-top: 0em; margin-bottom: 0.6em}
    DD.IndentedHanging {margin-left: 2.0em}
    DL.HangingInBulleted {font-family: "Times New Roman", Times, serif; margin-left: 2.0em; margin-right: 2.0em; margin-top: 0em; margin-bottom: 0.5em}
    DD.HangingInBulleted {margin-left: 4.0em}
    DL.SmallHanging {font-family: "Times New Roman", Times, serif; margin-left: 4.0em; margin-top: 0em; margin-bottom: 0.6em}
    DD.SmallHanging {margin-left: 7.5em}
    DL.SmallIndentedHanging {font-family: "Times New Roman", Times, serif; margin-left: 8.0em; margin-top: 0em; margin-bottom: 0.6em}
    DD.SmallIndentedHanging {margin-left: 2.0em}
    DL.SmallHangingInBulleted {font-family: "Times New Roman", Times, serif; margin-left: 6.0em; margin-right: 6.0em; margin-top: 0em; margin-bottom: 0.5em}
    DD.SmallHangingInBulleted {margin-left: 5.0em}
    DL.Enumerated {font-family: "Times New Roman", Times, serif; margin-right: 0.0em; margin-top: 0em; margin-bottom: 0.5em}
    DD.Enumerated {margin-left: 2.0em}
    DL.SmallEnumerated {font-family: "Times New Roman", Times, serif; margin-left: 4.0em; margin-right: 4.0em; margin-top: 0em; margin-bottom: 0.5em}
    DD.SmallEnumerated {margin-left: 2.5em}
    DL.NestedEnumerated {font-family: "Times New Roman", Times, serif; margin-left: 2.0em; margin-right: 2.0em; margin-top: 0em; margin-bottom: 0.5em}
    DL.SmallNestedEnumerated {font-family: "Times New Roman", Times, serif; margin-left: 6.0em; margin-right: 6.0em; margin-top: 0em; margin-bottom: 0.5em}
    </STYLE>
</HEAD>
<BODY TEXT="#000000" BGCOLOR="#FFFFF0" LINK="#0000FF" VLINK="#800080" ALINK="#FF0000">
<P><A HREF="RM-TOC.html">Contents</A>&nbsp;&nbsp;&nbsp;<A HREF="RM-0-29.html">Index</A>&nbsp;&nbsp;&nbsp;<A HREF="RM-3-6-2.html">Previous</A>&nbsp;&nbsp;&nbsp;<A HREF="RM-3-7.html">Next</A></P>
<HR>
<H1> 3.6.3 String Types</H1>

<H4 ALIGN=CENTER>Static Semantics</H4>
<DIV Class="Paranum"><FONT SIZE=-2>1</FONT></DIV>
<DIV Class="Normal">&nbsp;&nbsp;&nbsp;<A NAME="I1831"></A>A one-dimensional array type
whose component type is a character type is called a <I>string</I> type.</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>2</FONT></DIV>
<DIV Class="Normal" Style="margin-bottom: 0.4em">&nbsp;&nbsp;&nbsp;There are two predefined
string types, String and Wide_String, each indexed by values of the predefined
subtype Positive; these are declared in the visible part of package Standard:
</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>3</FONT></DIV>
<DIV Class="Examples"><TT><B>subtype</B>&nbsp;Positive&nbsp;<B>is</B>&nbsp;Integer&nbsp;<B>range</B>&nbsp;1&nbsp;..&nbsp;Integer'Last;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>4</FONT></DIV>
<DIV Class="Examples"><TT><B>type</B>&nbsp;String&nbsp;<B>is</B>&nbsp;<B>array</B>(Positive&nbsp;<B>range</B>&nbsp;&lt;&gt;)&nbsp;<B>of</B>&nbsp;Character;<BR>
<B>type</B>&nbsp;Wide_String&nbsp;<B>is</B>&nbsp;<B>array</B>(Positive&nbsp;<B>range</B>&nbsp;&lt;&gt;)&nbsp;<B>of</B>&nbsp;Wide_Character;<BR>
</TT></DIV>
<DIV Class="NotesHeader"><FONT SIZE=-1>NOTES</FONT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>5</FONT></DIV>
<DIV Class="Notes"><FONT SIZE=-1>49&nbsp;&nbsp;String literals (see <A HREF="RM-2-6.html">2.6</A>
and <A HREF="RM-4-2.html">4.2</A>) are defined for all string types.
The concatenation operator &amp; is predefined for string types, as for
all nonlimited one-dimensional array types. The ordering operators &lt;,
&lt;=, &gt;, and &gt;= are predefined for string types, as for all one-dimensional
discrete array types; these ordering operators correspond to lexicographic
order (see <A HREF="RM-4-5-2.html">4.5.2</A>).</FONT></DIV>

<H4 ALIGN=CENTER>Examples</H4>
<DIV Class="Paranum"><FONT SIZE=-2>6</FONT></DIV>
<DIV Class="Normal" Style="margin-bottom: 0.4em">&nbsp;&nbsp;&nbsp;<I>Examples of string
objects:</I> </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>7</FONT></DIV>
<DIV Class="Examples"><TT>Stars&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:&nbsp;String(1&nbsp;..&nbsp;120)&nbsp;:=&nbsp;(1&nbsp;..&nbsp;120&nbsp;=&gt;&nbsp;'*'&nbsp;);<BR>
Question&nbsp;&nbsp;&nbsp;:&nbsp;<B>constant</B>&nbsp;String&nbsp;&nbsp;:=&nbsp;&quot;How&nbsp;many&nbsp;characters?&quot;;<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>--&nbsp;Question'First&nbsp;=&nbsp;1,&nbsp;Question'Last&nbsp;=&nbsp;20</I><BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>--&nbsp;Question'Length&nbsp;=&nbsp;20&nbsp;(the&nbsp;number&nbsp;of&nbsp;characters)</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>8</FONT></DIV>
<DIV Class="Examples"><TT>Ask_Twice&nbsp;&nbsp;:&nbsp;String&nbsp;&nbsp;:=&nbsp;Question&nbsp;&amp;&nbsp;Question;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>--&nbsp;constrained&nbsp;to&nbsp;(1..40)</I><BR>
Ninety_Six&nbsp;:&nbsp;<B>constant</B>&nbsp;Roman&nbsp;&nbsp;&nbsp;:=&nbsp;&quot;XCVI&quot;;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>--&nbsp;see&nbsp;<A HREF="RM-3-5-2.html">3.5.2</A>&nbsp;and&nbsp;<A HREF="RM-3-6.html">3.6</A></I></TT></DIV>

<HR>
<P><A HREF="RM-TOC.html">Contents</A>&nbsp;&nbsp;&nbsp;<A HREF="RM-0-29.html">Index</A>&nbsp;&nbsp;&nbsp;<A HREF="RM-3-6-2.html">Previous</A>&nbsp;&nbsp;&nbsp;<A HREF="RM-3-7.html">Next</A>&nbsp;&nbsp;&nbsp;<A HREF="RM-TTL.html">Legal</A></P>
</BODY>
</HTML>