Which array is correct syntax in C

[DiepVien_007]

typedef enum {HOT, COLD} Temperature;

int main()
{
  Temperature TEMP;
                          
  float A[TEMP] = {75, 12};  /* this work, compiled no error */        
  float B[Temperature] = {80, 20}; /*this also work too, no error, why?

}

I really can not figure out which array is correct syntax and legal, A or B?
Can any one explain this to me.

Thank you.

DiepVien_007

[Prelude]

>I really can not figure out which array is correct syntax and legal, A or B?
Neither. A uses an automatic variable as the array size, a constant expression is required. B uses an enum type as the array size, which isn't legal as an expression. If your compiler accepts it then you're probably using special extensions that are on by default.

-Prelude

[Shiro]

The size of the array should be a constant. Define a constant and use that as size of the array or just use a number.

#define CONSTANT 2

int A [CONSTANT];
int B [2];