Ok so I've got these typedef structs: typedef struct {            float objectTransformX; } Object; typedef struct {            float lookAtZ; } SceneCamera; typedef struct {            Object *Object;            SceneCamera Camera;            bool Active; } Frames; And I've got this class: class Scenario {            private:                       int currentFrame;                       int fps;                       bool allowOverwrite;                       Frames *Frame;                       ..... } And I've got the constructor:  Scenario::Scenario(int objectCount,int lengthInSeconds,bool allowOverwrite,int fps) {            frameCount = lengthInSeconds*fps;            Frame = (Frames*)malloc(sizeof(Frames)*frameCount);            Frame->Object = (Object*)malloc(sizeof(Object)*objectCount);            ....            Frame[t].Camera.lookAtZ = 0;            for (int i = 0;i < objectCount;i++) {                       Frame[t].Active = false;                                                          Frame[t].Object.objectTransformX = 0;                       .....            } } Why do I get an exception when I try to assign a value to objectTransformX... I did allocate memory didn't I? I got an unhandled exception, which states that the memory is outside the program. CXX0030 error in VC++.