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struct flexArrayStruct {
     int num;
     int data[1];
};

/* ... */
/* Space is allocated for the struct */
struct flexArrayStruct *structP = malloc(sizeof(struct flexArrayStruct) + sizeof(int) * (ARRAY_SIZE - 1));
if (!structP) {
     /* handle malloc failure */
}
structP->num = SOME_NUMBER;

/* Access data[] as if it had been allocated as data[ARRAY_SIZE] */
for (i = 0; i < ARRAY_SIZE; i++) {
  structP->data[i] = i;
}

struct flexArrayStruct{
  int num;
  int data[];
};

/* ... */
/* Space is allocated for the struct */
struct flexArrayStruct *structP = malloc(sizeof(struct flexArrayStruct) + sizeof(int) * ARRAY_SIZE);
if (!structP) {
     /* handle malloc failure */
}

structP->num = SOME_NUMBER;

/* Access data[] as if it had been allocated as data[ARRAY_SIZE] */
for (i = 0; i < ARRAY_SIZE; i++) {
  structP->data[i] = i;
}