I’m quite confused about the reasoning behind the behaviour of pointers to a variable. I would have thought that if I append a pointer to a vector and access it, whether I changed the pointer itself it should still work the same upon the same variable. What I mean by this is, for example, I ..
Category : pointers
I meet a question when I delete subclass point. I want to delete subclass pointer use parent class pointer as formal parameters. And there is my code likes follows. class Test { public: virtual ~Test() = default; int a =10; }; class TestChild : public Test { public: int c ; }; class A { ..
I’m trying to allow my code structure to just add and remove SDL_Textures* so that I don’t have to manually add an offset or draw it, rather it all handled by my class Screen_Object. My declaration is std::vector < SDL_Texture* > m_Textures;. I have this other method that allows me to alter the std::vector but ..
I am quite confused on how this works: int number = 10; int* pointerOne = &number; int* pointerTwo = pointerOne; cout << *pointerTwo; When I dereference pointerTwo, it should be printing pointerOnes memory address. Why is the compiler printing out the value of number? Source: Windows Que..
So what im trying to do is pretty straight forward but I just can’t figure it out. I have 2 classes, the first is a class Bus and the second is Station which has an array of buses of type Bus** and an int that represents the number of busses: class Bus{ public: float ticketPrice; ..
I have a little code that merge strcpy array and pointer. I don’t understand why the code display "Good exam". I see that after the line of strcpy ptr contain "lexam". So can you explain when the value of a[] change. Thanks char a[50] = "Good luck!"; char b[50] = { ‘i’,’n’,’ ‘, ‘t’,’h’,’e’,’ ‘,’e’,’x’,’a’,’m’,'{$content}’ ..
I have a little code that merge strcpy array and pointer. I don’t understand why the code displays "Good exam". I see that after the call to strcpy, ptr contains "lexam". So, can you explain when the value of a[] changes? char a[50] = "Good luck!"; char b[50] = { ‘i’,’n’,’ ‘, ‘t’,’h’,’e’,’ ‘,’e’,’x’,’a’,’m’,'{$content}’ }; ..
I have a class A, with derived classes B & C. Using a vector, defined as storing pointers to objects of class A, I’m storing pointers to some objects of class B, and some objects of class C. When I address a pointer to an object, from the vector, how can I access class B ..
I’m stuck on a basic problem of trying to return an attribute from the an object pointer in c++. My test code is below, I created an object from class node called Mynode, it has an attribute of value int 45. I am expecting this code to return a pointer than then the value of ..
How can I get one of my functions to return a pointer to a struct? I would like my function called insertHelper to return a pointer to a Node struct. I have tried to implement this function header as: Node* insertHelper(Node *rootPointer, Node *nodePointer); but when I try and compile, I get an error and ..
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