How do you write a program in c plus plus to initialize the array in an class and then to input the data in it in one member function and output the data by using another member function?

Answer 1

A array within a class in C++ is no different than any other type of attribute in a class...

class myclass {

private:

int someInteger;

int somArray[10];

int *somePointer;

public:

myclass() { ... constructor ...}

myclass(const &myclass()) { ... copy constructor ...}

~myclass() { ... destructor ...}

mymethods() { ... methods, etc. ...}

private:

myhelpers() {... helpers, etc. ...}

}

Recall that arrays and pointers are tightly related. Well, in classes, also recall that their memory must be explicitly handled or you are going to have all sorts of problems. You need constructors and destructors, as well as copy constructors, to properly make deep copies and deallocations if arrays area in the form of pointers.

Answer 2

The following example uses a template class to contain an array of any type. Since you specifically asked about C++ code, the array is actually a vector (a dynamic array implemented as an object) as this greatly simplifies the code.

The array is initialised at the point of instantiation and is initially empty. The class has an append() member method that allows us to input new elements to the end of the array, while the array subscript operator ([]) is overloaded to allow us to output the individual elements from the array, just as if myArray were an actual array. If you do not wish consumers to modify elements within your array, remove the non-const version of the array subscript operator overload.

The main() function demonstrates how myArray objects can be used to store both integers and strings from literal constants.

#include<iostream>

#include<vector>

template<class T>

class myArray

{

public:

void add(T t){ m_data.push_back( t ); }

const T& operator[](const int element )const { return( m_data[element] ); }

T& operator[](const int element ) { return( m_data[element] ); }

private:

std::vector<T> m_data;

};

int main()

{

myArray<int> a;

a.add(1);

a.add(2);

std::cout<<a[0]<<" "<<a[1]<<std::endl;

myArray<char*> b;

b.add("String 1");

b.add("String 2");

std::cout<<b[0]<<" "<<b[1]<<std::endl;

return(0);

}