what is the problem to my code it said segmentation fault(core dumped)

#include

#include

#include

#include

typedef struct node

{

int* data;

struct node* link;

}NODE;

typedef struct

{

NODE* front;

NODE* rear;

int count;

}QUEUE;

void* createqueue()

{

QUEUE* q;

q = (QUEUE*)malloc(sizeof(QUEUE));

q->front = NULL;

q->rear = NULL;

q->count = 0;

return (q);

}

void enqueue(QUEUE* q, int* datain)

{

NODE* tem;

tem = (NODE*)malloc(sizeof(NODE));

tem->data = datain;

tem->link = NULL;

if (q->count = 0)

{

q->front = tem;

}

else

{

q->rear->link = tem;

}

q->rear = tem;

(q->count)++;

}

void dequeue(QUEUE* q, int* dataout)

{

*dataout = *q->front->data;

free(q->front->data);

if (q->count == 1)

{

q->front = q->rear = NULL;

}

else

{

q->front = q->front->link;

}

(q->count)--;

}

int main()

{

int num, *data;

srand(time(0));

QUEUE *q1, *q2;printf("text");

q1 = (QUEUE*)createqueue();

q2 = (QUEUE*)createqueue();

printf(" enqueue q1 data:");

for (int i = 0; i < 20; i++)

{

num = rand() % 100 +1;

enqueue(q1, &num);

printf(" %d", num);

}

for (int j = 0; j < 20; j++)

{

data = (int*)malloc(sizeof(int));

dequeue(q1, &num);

*data = num;

enqueue(q2, data);

}

printf("data in q2");

for (int k = 0; k < 20; k++)

{

dequeue(q2, &num);

printf("%d", num);

}

system("pause");

return 0;

}