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Warning C259: '=': different enumeration types

Abdelillah ymlahi

C51: V7.50

When I try to build the following code, I receive Warning C259, complaining about enumeration types :

typedef enum { ZERO, ONE, TWO } Numbers;

void main(void)
{
Numbers e_numbers;

e_numbers = (Numbers) ( ZERO |ONE |TWO );
}

  • 0

    ZERO | ONE | TWO produces the value 3 decimal, which is not a defined member of the enumeration. The warning message is obscure, but the compiler is trying to tell you that you are assigning a constant value not defined as part of your enumeration.

    One fix is

    typedef enum
    { ZERO, ONE, TWO, THREE }
    Numbers;

    Or, reconsider the assignment statement. Is it really a meaningful operation to OR members of this enum together?

  • 0 in reply to Drew Davis

    "Is it really a meaningful operation to OR members of this enum together?"

    eg, are you confusing this with a Pascal set...?