int main(){
    int a=76;
    int *ptra=&a;
    printf("address of pointer to a is %p\n",&ptra);
    printf("address of a is %p\n",&a);
    printf("address of a is %p\n",ptra);
    printf("value of a is %d\n",*ptra);
    printf("value of a is %d\n",a);
    return 0;
}