how to add three objects of same class in c++? [duplicate]

Answer 1

you have to change a little the operator and you have a mistake in the inizialization of the variables (C3 is not initialized). You have not to define an operator that works on three terms at the same time. The sum will be split in two parts (c1 + c2) + c3; the first sum returns a 'complex' item that is added to c3. The result of this last sum is assigned to c4. See below the code.

#include 
#include 
using namespace std;

class complex{
private:
    int a;
public:
    void setdata(int x){
        a = x;
    }
    void showdata(){
        cout << "\n" << a;
    }
    complex operator +(complex c){
        complex temp;
        int i = 0;
        i = a + c.a;
        temp.setdata(i);
        return temp;
    }
};

int main(){
    complex c1, c2, c3, c4;
    c1.setdata(3);
    c2.setdata(5);
    c3.setdata(2);
    c4 = c1 + c2 + c3;
    c4.showdata();
}