Question

Sorry for this Noobie question, I just can’t make either of the following code work?

snippet 1:

int main(void) {
    void *ptr;
    *ptr = 1;
    printf("%d", *ptr);
    return 0;
}

snippet 2:

int main(void) {
    void *ptr;
    int a = 1;
    ptr = &a;
    printf("%d", *ptr);
    return 0;
}

snippet 3:

int main(void) {
    void *ptr;
    int a = 1;
    (int*)ptr = &a;
    printf("%d", *ptr);
    return 0;
}

any idea?

Answer 1

dereferencing void pointer is undefined behaviour

You should try this

ptr=(int*)&a;

create one pointer of type int

and then assign this ptr to that and you can dereference that pointer

int *p;
p=ptr;
printf("%d",*p);