If I want changes to be persistent with basic data type variables (like ints or floats) why would I pass references to those variables rather than pass them by value? Discuss using an example. [4 marks] 1. 2. A function in C+ needs to be forward declared before we can use it, often in header files. What do we mean by this? [3 marks] How does a vector from the Standard Template Library compare with a standard one- dimensional array? What similarities are there? What differences? [4 marks] 3. . What do we mean by "dereferencing" a pointer? Provide an example of when we may use a pointer normally and dereferenced. [4 marks] What are we referring to when we talk about the stack and the heap? Provide an example of declaring an int on the heap, and also an example of declaring one on the stack. [4 marks] 5. What happens if we try to read or write past the end of an array with our C++ code? Is the behaviour consistent? Explain why or why not, describing how arrays are represented in memory. [4 marks] 6. 7. Why in C++ do we need destructors? Provide a practical example of why having a destructor coded would be important. [4 marks] 8. What does the C++ virtual keyword do? [3 marks]