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Friend classes are used when two or more classes are designed to work together and need access to each other's implementation in ways that the rest of the world shouldn't be allowed to have. In other words, they help keep private things private. For instance, it may be desirable for class DatabaseCursor to have more privilege to the internals of class Database than main() has.

Classes and objects are separate but related concepts. Every object belongs to a class and every class contains one or more related objects. - A Class is static. All of the attributes of a class are fixed before, during, and after the execution of a program. The attributes of a class don't change. - The class to which an object belongs is also (usually) static. If a particular object belongs to a certain class at the time that it is created then it almost certainly will still belong to that class right up until the time that it is destroyed. - An Object on the other hand has a limited lifespan. Objects are created and eventually destroyed. Also during that lifetime, the attributes of the object may undergo significant change.

"Poly" means "many" and "morph" means "form". Polymorphism is the ability of an object (or reference) to assume (be replaced by) or become many different forms of object. Example: function overloading, function overriding, virtual functions. Another example can be a plus ‘+’ sign, used for adding two integers or for using it to concatenate two strings.

The real power of arrays comes from their facility of using an index variable to traverse the array, accessing each element with the same expression a[i]. All the is needed to make this work is a iterated statement in which the variable i serves as a counter, incrementing from 0 to a.length -1. That is exactly what a loop does.

Basic example for C++ Academic Project help is as follows :

  #include<iostream>
using namespace std;

int recursive_function(int n){
    static int i=1;// to make one time initialization
    cout<<i<<" : time"<<endl; // counting the function calls

    if(n==1){
      return 1;//base case
       }
   else{
        i++;
        return  n=n*recursive_function(n-1);
        }
}

int main(){

    cout<<"Enter to number to find Factorial: ";
    int num;
    cin>>num;
    num=recursive_function(num); // function call
    cout<<"\n\n\n\t\t\tFactorial of number is: "<<num;
    cout<<"\n\n\n\n\n";
return 0;
}

 

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