Passing integer to a function that has enum as input parameter

Question

I've got a question

What shall happen if we have the following :

typedef enum  {s1=0,s2,s3} states ;

void test( states x ) ;

when using the function test , what happens if I use it like the following :

test(6);

Shall it be mapped to the nearest enum value , or it needs to be handled in the function implementation ?

What language ? Please tag appropriately. Note that this would give you a compile-time error in most sensible languages. — Paul R, Jun 04 '14 at 10:41
Sorry , forgot to write it , I want to know this in CAPL as well as C — Mohammed Abdelhamid, Jun 04 '14 at 10:46

score 2 · Answer 1 · answered Jun 04 '14 at 10:51

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enum are effectively treated as int by most C compilers. They are just syntactic sugar to make code more readable. In your case, 6 will be passed to the function and the function has to handle it.

answered Jun 04 '14 at 10:51

Akhi

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alk · Answer 2 · 2014-06-04T11:14:13.950

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[for C]

If doing

test(6);

6 will be passed to test() (as enums are (treated as) ints) and it shall be trapped by the function's input validation.

Update:

Input validation is not done automagically. It needs to be coded explicitly.

edited Jun 04 '14 at 11:14

answered Jun 04 '14 at 10:48

alk

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Sorry , Sounds I did not get you correctly , does that mean a compilation error , or I should handle all of the cases in the function implementation ? – Mohammed Abdelhamid Jun 04 '14 at 10:51
@MohammedAbdelhamid: Please see the update to my answer. – alk Jun 04 '14 at 10:57

Passing integer to a function that has enum as input parameter

2 Answers2