Dynamic Array Compile error

[alex067]

I have several compile errors which I cannot for the life of me fix

#include <cstdlib>
#include <string>
#include <iostream>


string* addEntry(string *dynamicArray[], int &stringSize, string newEntry); //adds entry to dynamic array
string *deleteEntry(string *dynamicArray[], int &stringSize, string entryToDelete); //removes entry to dynamic array
void printString(string &dynamicArray[], int stringSize); //prints out array



using namespace std;

int main()
{
   int stringSize = 5; //size of string array
   string *names=new string[stringSize]; //dynamic array, size dependant upon runtime

   names[0] = "Alex";
   names[1] = "Cozi";
   names[2] = "Kevin";
   names[3] = "Tom";
   names[4] = "Stelios";

   cout << "Here is the starting list: ";
   printString(names, stringSize); //function call to print names

   names = addEntry(names, stringSize, "Alex");
   names = addEntry(names, stringSize, "Cozi");
   names = addEntry(names, stringSize, "Kevin");
   names = addEntry(names, stringSize, "Tom");
   names = addEntry(names, stringSize, "Stelios");


   cout <<"Here are the entered names: " <<endl;
   printString(names, stringSize);

   names=deleteEntry(names, stringSize, "Stelios");
   names=deleteEntry(names, stringSize, "Cozi");

   cout <<"After deleting names, here are the remaining entries: " <<endl;
   printString(names, stringSize);

   delete[] names;

   return 0;
}

string *addEntry(string *dynamicArray[], int &stringSize, string newEntry)
{
    string *newNames = new string[stringSize +1];
    for (int i = 0; i < stringSize; i++)
    {
        newNames[i]=dynamicArray[i];
    }
    newNames[stringSize]= newEntry;
    stringSize++;
    delete[] dynamicArray; //delete array, reallocate memory
    return newNames; //return new array information

}
string *deleteEntry(string *dynamicArray[], int &stringSize, string entryToDelete)
{
    string *deleteResult = dynamicArray;
    int count;
    count = 0; //initialize starting value for count

    for (int i = 0; i < stringSize; i++)
    {
        if(dynamicArray[i] = entryToDelete)
        {
            count = i;
            break;
        }

    }
    if (count == 1) //if entry is not found, return the list
    {
        return deleteResult;
    }
    else //return update list
    {
        deleteResult = new string[stringSize - 1];
        int count = 0;
        for (int i =0; i <stringSize; i++)
        {
            if(i!=count)
            {
                deleteResult[count]=dynamicArray[i];
                count++;
            }
        }
        stringSize--;
        delete[] dynamicArray;
    }
    return deleteResult;
}
void printString(string &dynamicArray[], int stringSize)
{
    for (int i =0; i < stringSize; i++)
    {
        cout << *(dynamicArray + i) << endl;
    }
}

[keskiverto]

What is the error message?

'names' is a pointer to string. Pass a pointer to string to the functions, not an array of string pointers as you do now.

[alex067]

What do you mean pass a pointer to string to the functions? Can you provide an example?

[keskiverto]

This is what you use now:
string* foo( string* bar[] ); bar is an array of pointers.

However, within the function:

string* foo( string* bar[] )
{
  cout << bar[0];
}

What is printed here? The first element of the array bar. That element is a pointer. Printing a pointer prints a memory address. The pointer could print to a string object, and that object could contain text, but this syntax will not reach it.

Syntactically ok, but probably not what you expect.

There is more. You use it like this:

string* gaz = new string[42];
gaz[0] = "hello";

foo( gaz );

gaz is a pointer. Dereferensing it with gaz[0] is same as *(gaz + 0) is same as *gaz. The "hello" is copied to the first string object within that block of 42 string objects in free store memory area.

Then the compile error. You do give a string * (gaz) to a function that requires a string * [].

Ditch the array:

string* foo( string* bar )
{
  cout << bar[0];
}

Now the dereferencing of the pointer yield a string object and the stream should show "hello".