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CopyConstructor.cpp
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CopyConstructor.cpp
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#include <iostream>
using namespace std;
class Number
{
private:
int a;
public:
Number()
{
a = 0; // (1)
};
Number(int num)
{
a = num;
}
Number(Number &obj)
{ // copy constructor
cout << "copy constructor called!!!" << endl;
a = obj.a;
}
// when no copy constructor is found, compiler supplies its own copy constructor.
void printNumber()
{
cout << "The number is: " << a << endl;
}
};
int main()
{
// Number n1(7);
// n1.printNumber();
// output: The number is: 7 ---> when (1) is commented
//********************************************************************************************
// Number n1, n2, n3;
// output:
// Error->no default constructor ---> when(1) is commented
//**********************************************************************************************
Number n1, n2, n3(35);
n1.printNumber();
n2.printNumber();
n3.printNumber();
//**********************************************************************************************
// Copy constructor
// To make n4 exactly like n3
Number n4(n3);
n4.printNumber();
return 0;
}