Question

Can anyone please point out why I get the syntax error: expected expression before '{' tokenin

T[SIZE] = {NULL}; 

in the code segment below?
Thanks.

typedef struct SetObject{
    int key;
    struct SetObject *prev;
    struct SetObject *next;
} Node;

Node *T[SIZE]; //global variable

void initT(void) {
    T[SIZE] = {NULL};
}

Answer 1

To assign a pointer value to an array element, use:

T[SIZE] = NULL;

The curly brackets around NULL are not needed.

The second problem is that SIZE is an invalid index into the T array. The valid indexes range from 0 through SIZE-1. Assigning to T[SIZE] will lead to undefined behaviour.