Thread: No Match For Operator+ ???????

My Class:

Code:

#include <iostream>
#include <string>
using namespace std;

class Integer
{
  public:
    Integer(int i);
    Integer(std::string str);

    int getValue();
    void setValue(int i);
    void add(Integer& i);
    void subtract(Integer& i);
    void multiply(Integer& i);
    void divide(Integer& i);
  private:
    int myInteger;
};

My Implementation:

Code:

#include <iostream>
#include <string>
#include "integer.h"

Integer::Integer(int i)
{
  myInteger = i;
}

Integer::Integer(std::string str)
{
  myInteger = atoi( str.c_str() );
}

int Integer::getValue()
{
  return myInteger;
}

void Integer::setValue(int i)
{
  myInteger = i;
}

void Integer::add(Integer& i)
{
  myInteger = myInteger + i;
}

void Integer::subtract(Integer& i)
{
  myInteger = myInteger - i;
}

void Integer::multiply(Integer& i)
{
  myInteger = myInteger * i;
}
void Integer::divide(Integer& i)
{
  myInteger = myInteger / i;
}

Errors:

Code:

integer.cpp: In member function ‘void Integer::add(Integer&)’:
integer.cpp:31: error: no match for ‘operator+’ in ‘((Integer*)this)->Integer::myInteger + i’
integer.cpp: In member function ‘void Integer::subtract(Integer&)’:
integer.cpp:36: error: no match for ‘operator-’ in ‘((Integer*)this)->Integer::myInteger - i’
integer.cpp: In member function ‘void Integer::multiply(Integer&)’:
integer.cpp:41: error: no match for ‘operator*’ in ‘((Integer*)this)->Integer::myInteger * i’
integer.cpp: In member function ‘void Integer::divide(Integer&)’:
integer.cpp:46: error: no match for ‘operator/’ in ‘((Integer*)this)->Integer::myInteger / i’
make: *** [integer.o] Error 1

Why is this happening??? Why can't I freaking *ADD*?????