如何检查 C 中的枚举值？

Question

I'm reading through a library and found an enumeration that looks like this:

typedef enum
{
  IS_SYNCED    = 0;  //Determines if device is in/out of sync
  IS_VALID_REF = 1;  //Determines if device reference is valid
} EVENT;

I'm wondering how the to check what the value of IS_SYNCED would be?

Answer 1

You can compare enum values with == .

EVENT e = IS_SYNCED;

if(e == IS_SYNCED)
    printf("Is synced event\n");
else if(e == IS_VALID_REF)
    printf("Is valid ref event\n");
else
    printf("Unknown event\n");

prints:

Is synced event

You can also use switch :

EVENT e = IS_SYNCED;

switch(e) {
case IS_SYNCED:
    printf("Is synced event\n");
    break;
case IS_VALID_REF:
    printf("Is valid ref event\n");
    break;
default:
    printf("Unknown event\n");
    break;
}