Thread: operator overloading slight problem

got this assignment to write a class for sets and provide various member functions e.g add code, set union. each set has a certain number of codes. each code is a 5 charater c-string. i cant seem to get the set union (below) working.

Code:

class set
{
public:
	set();
	set operator+( const set& u ) const; //this operator is the set_union() function
	
private:
    char (*codes)[string_length];               //variable codes is a pointer to an array of characters "5"               
	int num_codes;                              //the memory for the number of codes and the 5 character string 
};//end

set set::operator+( const set& u ) const
{
    int i, j = 0;
    set union_set;
    union_set.num_codes = num_codes + u.num_codes;	// e.g num_codes = 2 and u.num_codes = 1, union_set.num_codes = 3
    union_set.codes = new char[union_set.num_codes][string_length]; //allocate memory needed
    for (i < 0; i < num_codes; i++)
    {
        for (j = 0; j < string_length; j++)	//codes from a will go into union_set.codes e.g union_set.codes[0][2] = codes[0][2]
	    {
            union_set.codes[i][j] = codes[i][j];
        }
    }
    for (i = num_codes; i < union_set.num_codes; i++)	//codes from a will go into union_set.codes e.g union_set.codes[2][2] = u.codes[0][2]
    {
        for (j = 0; j < string_length; j++)
	    {
            union_set.codes[i][j] = u.codes[i-num_codes][j];	//u.codes[i-num_codes] means u.codes starts at 0
        }
    }   
    return union_set;
}

void main()
{
set a, b, un;
un = a + b;
}

the codes from a (codes) and b (u.codes) dont seem to get stored in union_set.
anyhelp would be grateful as assignment is due in soon, thanks

> for (i < 0; i < num_codes; i++)
Look closely at your for-loop initial condition:

Code:

    for (i < 0; i < num_codes; i++)

> for (i < 0; i < union_set.num_codes; i++)

And did you ever store anything in your set?