Question

In C++, create a class, called DynamicCharArray, which wraps around the standard char array and offers the following features: • Default constructor: initializes an internal array of 8 elements • Copy constructor: called implicitly when making a copy • int size(): returns the length of the array • void expand(int amount): increases the capacity of the array by the specified amount. It will need to create a new internal array and copy the elements over to accomplish this correctly, but it need not initialize the increased space. • Destructor: if the solution allocates heap memory, the destructor shall free it.

Answer 1

`Hey,

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class DynamicCharArray {
        
        char *data;
        int n;
        public:
        
        DynamicCharArray() {
                data = new char[8];
                n = 8;
        }
        DynamicCharArray(const DynamicCharArray &other) {
                n = other.n;
                data = new char[n];
                
                for(int i=0; i<n; i++) {
                        data[i] = other.data[i];
                }
        }
        
        int size() {
                return n;
        }
        
        void expand(int amount) {
                int newSize = n + amount;
                char *newData = new char[newSize];
                
                for(int i=0; i<n; i++) {
                        newData[i] = data[i];
                }
                n = newSize;
                delete [] data;
                data = newData; 
        }

        ~DynamicCharArray() {
                delete [] data;
        }
};

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