Create a copy constructor - C++ Class

C++ examples for Class:Constructor

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Description

Create a copy constructor

Demo Code

                                                                                                        
#include <iostream>
#include <iomanip>
using namespace std;
// declaration section
class Complex/*  www . j ava 2s  .  c o  m*/
{
   private:
   double realPart;       // declare realPart as a double variable
   double imaginaryPart;   // declare imaginaryPart as a double variable
   public:
   Complex(double real = 0.0, double imag = 0.0)  // inline constructor
   {
      realPart = real;
      imaginaryPart = imag;
   }
   Complex(const Complex&);      // copy constructor
   void showComplexValues();     // accessor prototype
   void assignNewValues(double real, double imag);  // inline mutator
};   // end of class declaration
// implementation section
Complex::Complex(const Complex& existingNumber)  // copy constructor
{
   realPart = existingNumber.realPart;
   imaginaryPart = existingNumber.imaginaryPart;
}
void Complex::showComplexValues()  // accessor
{
   char sign = '+';
   if (imaginaryPart < 0) sign = '-';
   cout << realPart << ' ' << sign << ' ' << abs(imaginaryPart) << 'i';
}
int main()
{
   Complex a(2.3, 10.5), b(6.3, 19.2);  // use the constructor
   Complex c(a);    // use the copy constructor
   Complex d = b;   // use the copy constructor
   cout << "Complex number a is ";
   a.showComplexValues();
   cout << "\nComplex number b is ";
   b.showComplexValues();
   cout << "\nComplex number c is ";
   c.showComplexValues();
   cout << "\nComplex number d is ";
   d.showComplexValues();
   return 0;
}

Result


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