Implementing add(), subtract() and multiply() for Integer class - C++ Class

C++ examples for Class:Member Function

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Description

Implementing add(), subtract() and multiply() for Integer class

Demo Code

                                              
#include <iostream>
                                              
class Integer/*from   ww w  .  j  a  v  a  2s.  c o m*/
{
private:
  int n;
                                              
public:
  Integer(int m = 0);
  Integer(Integer& obj);                 // Copy constructor
  int compare(const Integer& obj) const; // Compare function with reference paramter
  int getValue() {return n;}
  void setValue(int m){ n = m; }
  void show();
                                              
  Integer* add(const Integer& obj);
  Integer* add(int m);
  Integer* subtract(const Integer& obj);
  Integer* subtract(int m);
  Integer* multiply(const Integer& obj);
  Integer* multiply(int m);
                                              
};
using std::endl;
                                              
// Copy constructor
Integer::Integer(Integer& obj) : n(obj.n)
{
  std::cout << "Object created by copy constructor." << std::endl;
}
                                              
// Constructor
Integer::Integer(int m) : n(m)
{
  std::cout << "Object created." << std::endl;
}
                                              
Integer* Integer::add(const Integer& obj)
{
  n += obj.n;
  return this;
}
                                              
Integer* Integer::subtract(const Integer& obj)
{
  n -= obj.n;
  return this;
}
                                              
Integer* Integer::multiply(const Integer& obj)
{
  n *= obj.n;
  return this;
}
                                              
void Integer::show() {
  std::cout << "Value is " << n << std::endl;
}
                                              
// Compare function with reference parameter
int Integer::compare(const Integer& obj) const {
  if(n < obj.n)
    return -1;
  else if(n==obj.n)
    return 0;
  return 1;
}
                                              
int main()
{
  Integer a {4};
  Integer b {6};
  Integer c {7};
  Integer d {8};
  Integer x {5};
                                              
  Integer result {a};                       // Set result object as copy of a
  Integer* pResult = &result;
  std::cout << "Result is "
            << pResult->multiply(x)->add(b)->multiply(x)->add(c)->multiply(x)->add(d)->getValue()
            << std::endl;
}

Result


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