#include<stdio.h>
#include<stdlib.h>

typedef int itype;

typedef struct Cq{
    int size,count,front,rear;
    itype *a;
}Cq;

void initialize(Cq * ref,int n) {
    ref->count=0;
    ref->size=n;
    ref->front=0;
    ref->rear=-1;
    ref->a=(int *)malloc(n*sizeof(int));
    if(ref->a==NULL) {
        printf("Memory not allocated");
        exit(1);
    }
    printf("1");
}

char isfull(Cq *ref) {
    return ref->count==ref->size;
}

char isempty(Cq *ref) {
    return ref->count==0;
}

void insert(Cq *ref,itype x) {
    if(isfull(ref)) {
        printf("Queue full");
        exit(2);
    }
    ref->rear=(ref->rear+1)%(ref->size);
    ref->a[ref->rear]=x;
    ref->count=ref->count+1;
    printf("2");
}
int size(Cq *ref) {
    return ref->count;
}

int main() {
    Cq a;
    initialize(&a,5);
    insert(&a,10);
    insert(&a,20);
    insert(&a,30);
    insert(&a,40);
    return 0;
}

I was asked to make circular queue with count in my proficiency test today but it was giving me error. Can you help me find out error in this code.