Dereferencing pointer to an incomplete type

Question

I am writing a simple program to add two complex number using struct. All goes well except that when printing the values, I get an error that I am dereferencing an incomplete pointer.

Here is the code:

struct complexNumber * n1 = (struct complexNumber *) createNumber(10,10);
struct complexNumber * n2 = (struct complexNumber *) createNumber(03,12);
struct complexNumber * n3 = (struct complexNumber *) addComplexNunbers(n1,n2);

printf("Real Part: %d Imaginary Part: %d",n3->real,n3->imaginary);  

Answer 1

您需要include标头fine，它定义了struct complexNumber 。

Answer 2

The whole point of using incomplete type is to make the program able to use a pointer to an object, without knowing the implementation of said object.

Therefore, it never makes any sense to access the pointed-to contents of an incomplete type.