c++ - Problems with personally constructed complex number class -


i having trouble figuring out why complex number class isn't adding correctly or working how want to. when add 2 complex numbers weird isn't supposed be. keep trying figure out what's wrong, can't quite figure out. need keep structure because going use purpose.

#include <iostream> #include <cmath>  using namespace std;  class complexnumber{ private:     double real, imag; public:     complexnumber(double i,double j){     real = i;     imag = j;}      complexnumber add(complexnumber c){     real += c.real;     imag += c.imag;     }      complexnumber squared(){     real = (pow(real,2) - pow(imag,2));     imag = 2*real*imag;     }      double abs() {     return sqrt(real*real + imag*imag);     }     void print(){         char sign = (imag<0) ? '-' : '+';         cout<<real<<" "<<sign<<" "<<(imag>0 ? imag : -imag)<<'i'<<endl;     }  };  int main() { complexnumber c1(3,4), c2(1,1); complexnumber c3=c1.add(c2); c3.print(); return 0; }

your add member function promises return complexnumber doesn't. attempt use return value, invoking undefined behaviour. squared broken.

you need figure out whether want add implement behaviour of operator += or +. in first case, you'd need return reference object being modified:

complexnumber& add(complexnumber c) {//          ^   real += c.real;   imag += c.imag;   return *this; }

in second case, not modify object create new 1 , return it:

complexnumber add(complexnumber c) {   return complex(real + c.real, imag + c.imag); }

note in case may make sense use non-member function instead.

i suggest looking @ std::complex example of implementation.


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