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
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<HTML>
<HEAD>
<TITLE>SWITCH Switch statement
</TITLE>
</HEAD>
<BODY>
<H2>SWITCH Switch statement
</H2>
<P>
Section: <A HREF=sec_flow.html> Flow Control </A>
<H3>Usage</H3>
The <code>switch</code> statement is used to selective execute code
based on the value of either scalar value or a string.
The general syntax for a <code>switch</code> statement is
<PRE>
switch(expression)
case test_expression_1
statements
case test_expression_2
statements
otherwise
statements
end
</PRE>
<P>
The <code>otherwise</code> clause is optional. Note that each test
expression can either be a scalar value, a string to test
against (if the switch expression is a string), or a
<code>cell-array</code> of expressions to test against. Note that
unlike <code>C</code> <code>switch</code> statements, the FreeMat <code>switch</code>
does not have fall-through, meaning that the statements
associated with the first matching case are executed, and
then the <code>switch</code> ends. Also, if the <code>switch</code> expression
matches multiple <code>case</code> expressions, only the first one
is executed.
<H3>Examples</H3>
Here is an example of a <code>switch</code> expression that tests
against a string input:
<P>
<PRE>
switch_test.m
function c = switch_test(a)
switch(a)
case {'lima beans','root beer'}
c = 'food';
case {'red','green','blue'}
c = 'color';
otherwise
c = 'not sure';
end
</PRE>
<P>
Now we exercise the switch statements
<PRE>
--> switch_test('root beer')
ans =
food
--> switch_test('red')
ans =
color
--> switch_test('carpet')
ans =
not sure
</PRE>
<P>
</BODY>
</HTML>
|
