My question is at the bottom.

I am creating a module for a Mark to encapsulate between 0 and 100.

I have a few operator and conversion overload functions so far:

class Mark {

 int mark; 

public:

 Mark(); //constructor ~Mark(); //deconstructor Mark(int value); // mark is created using int value that sets the value of mark void setEmpty(); // mark = 0 bool isValid()const; //checks if mark is valid //type conversion operator int() const; // mark casted to an int. result would be value of the mark or zero if mark is invalid operator double() const; //mark casted to a double for gpa..equivalent of int value operator char() const; // mark casted to char type...result would be grade latter value of mark //binary member operator Mark& operator += (int w); // int is added to the value of mark Mark& operator = (int i); // mark is set to an integer 

};

main program

#include  #include "Mark.h" using namespace std; using namespace sdds; int main() { Mark m, n(25), k(200), p(-10); cout << "int ............" << endl; cout << int(m) << endl; cout << int(n) << endl; cout << int(k) << endl; cout << int(p) << endl; cout << "+= ............." << endl; cout << int(m += 20) << endl; cout << int(n += 20) << endl; cout << int(k += 20) << endl; cout << int(n += 60) << endl; cout << "= .............." << endl; cout << int(m = 80) << endl; cout << int(n = 120) << endl; cout << int(k = 70) << endl; cout << "double ........." << endl; m = 50; n = 80; k = 120; cout << double(m) << endl; cout << double(n) << endl; cout << double(k) << endl; cout << "char ..........." << endl; cout << char(m) << endl; cout << char(n) << endl; cout << char(k) << endl; cout << "int += Mark ..." << endl; int val = 60; cout << (val += n) << endl; cout << (val += k) << endl; return 0; } 

output

int ............ 0 25 0 0 += ............. 20 45 0 0 = .............. 80 0 70 double ......... 1 4 0 char ........... D A X int += Mark ... 140 140 

HERE IS MY QUESTION

So I am trying to add mark to an integer and return that integer and any invalid marks would not add any value to the integer. In the main program, this is the code, its the very last 2 lines.

Mark n(80), k(120); cout << (val += n) << endl; cout << (val += k) << endl; 

and the output would be

140 140 

I am not able to define this without their being errors saying that my += operator from above is ambiguous. So I am thinking that this needs to be a helper function?

Any help on how to go about this? Any suggestions? Any hints?