Understanding switch and case expressions

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Joe
Joe 2013-3-12
a = 'hi';
switch a
case {'hi','hello'}
disp('hi, hello')
case 'hi'
disp('hi')
end
When executing this code, the result is hi, hello. This does not make sense to me. If a = 'hi', then according to the case 'hi' shouldn't the result just be hi. Why is it hi, hello?

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Ryan Livingston
Ryan Livingston 2013-3-12
编辑：Ryan Livingston 2013-3-12
The cases are checked in order. Since a = 'hi' and 'hi' is in the first case, that one is chosen.
Using a cell array:
case {'hi', 'hello'}
disp('hi, hello');
means "pick this case if "a" is either 'hi' or 'hello'. It is somewhat equivalent to saying:
if strcmp(a,'hi') || strcmp(a,'hello')
 disp('hi, hello');

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