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joseperri
Joined: 24 May 2019
Posts: 5
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| typedef enum |
 Posted: Fri May 24, 2019 7:26 pm |
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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;
} |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19529
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| Posted: Fri May 24, 2019 10:42 pm |
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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. |
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joseperri
Joined: 24 May 2019
Posts: 5
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| Posted: Sat May 25, 2019 5:58 pm |
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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
} |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19529
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| Posted: Sat May 25, 2019 11:42 pm |
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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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