Creating new "dynamic" objects? - c++

Question

What is the best way of creating dynamic (not sure if this is the correct word) objects? For example, if I run the following:
Person man[10];
cout << "MENU" << endl;
cout << "1. Add a person to the list" << endl;
cout << "2. Delete a person from the list" << endl;
cout << "3. Change a person's information'" << endl;
cout << "4. Locate a person by ID number" << endl;
cout << "5. Locate a person by last name" << endl;
cout << "6. Print the list on the screen" << endl;
cout << "7. Load the list from a file" << endl;
cout << "8. Save the list to a file" << endl;
cout << "9. Exit the program" << endl;
cin >> a;
if (a == 1) {
if (i <= 10) {
Person man[i];
cout << "Please enter your last name: " ;
cin >> last;
man[i].setLastName(last);
i++;
cout << man[i].getLastName();
}
}
When I run this, I am allowed to enter my last name, but when I press ENTER the program stops running. What is the reason for this and is there a better way to create these objects "profiles"?
Thank you and I'm sorry if this is a stupid question.

Answer 1

The reason is your entire program only take one input cin >> a; and then check if its equal to 1. After the block the program has nothing left to do. So your program terminated.
If you want to edit all first name and last name of your 10 Person obj, you'd better create a loop to do that. For loop, you can google for / while.
Heres a example:
int i;
while(cin >> i)
{
if(i == 9)
return;
else if[....]
}

Answer 2

When you say dynamic, object allocation is via new operator. In your code, the array is already declared with 10 elements(static allocation). Hence in you code you are not performing dynamic allocation.
For dynamic allocation,add a function which can return you a new Person object. In this function create a object using new operator and return this object.
This way you add new objects dynamically.
Refer to new operator for more details on dynamic allocation.