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typedef enum

 
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joseperri



Joined: 24 May 2019
Posts: 5

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typedef enum
PostPosted: Fri May 24, 2019 7:26 pm     Reply with quote

hello, the following code should not generate a compile warning? since the assigned value is not within the range of the enum (100>ERROR_EXISTENTE)
My compiler is 5.076.
Thank you
José
Code:

 typedef enum {
    OK_GRABADO,
    OK_BORRADO,
    ERROR_EXP_TPO,
    ERROR_USER_CANCEL,
    ERROR_MAX_CANT,
    ERROR_EXISTENTE,
} var_t;

var_t i;


void main(void){
    i=100;
}
Ttelmah



Joined: 11 Mar 2010
Posts: 19195

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PostPosted: Fri May 24, 2019 10:42 pm     Reply with quote

No. In C, there is no testing of number validity. You can perfectly well
put a million into an int16. All that happens is that the part of the number
that fits is stored.
joseperri



Joined: 24 May 2019
Posts: 5

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PostPosted: Sat May 25, 2019 5:58 pm     Reply with quote

Thank you very much for the prompt response, if you allow me I ask you another question in the same line. The following code defines two types of data: colors_t and shapes_t, if I make an erroneous assignment using eg a variable myShape generates a warning which warns against an error but if the erroneous assignment is made within the object structure the compiler does not generate no warning The only object for which I want to work in this way is to avoid errors of assigning values to variables that are usually within structures.
Again, thanks for any advice or support
José
Code:

typedef enum{
    RED,
    BLUE,
} colors_t;

typedef enum {
    CIRCLE,
    SQUARE,
    RECTANGLE,
    TRIANGLE,
} shapes_t;

struct{
    colors_t color;
    shapes_t shape;
}object;

shapes_t myShape;
colors_t myColor;


void main(void){
    object.color=RED;
    object.shape=CIRCLE;
    object.shape=RED;//SHOULD NOT GENERATE A WARNING?
   
    myColor=RED;
    myShape=CIRCLE;
    myShape=RED;//GENERATE A WARNING ENUM IS NOT A CORRECT TYPE
   
}
Ttelmah



Joined: 11 Mar 2010
Posts: 19195

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PostPosted: Sat May 25, 2019 11:42 pm     Reply with quote

No. Neither will warn in any way.

Understand that an enum, is not a type.
Your color enum, is basically equivalent to just:

#define RED 1
#define BLUE 2

shapes_t, and colors_t, are just int's.

myShape=RED;

Is just saying put the integer '1' into the int variable. Not illegal in any way.

C requires _you_ to check your values and types....

Use a LINT if you want stricter checking. LINT was a Unix program written
many years ago, to catch 'bits of fluff' in C programming. So to look for
things like this that the compiler will not spot, but which might be an
issue. There are quite a few implementations around.
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