有以下程序:
#include ＜iostream＞
using namespace std;
class Complex
public:
Complex(double r=0,double i=0):re(r),im(i)
double zeal() const return re;
double imag() const return im;
Complex operator+(Complex c) const
return Complex(re+c.re,im+c.im);
private:
double re,im;
;
int main()
Complex a=Complex(1,1)+Complex(5);
cout＜＜a.real()＜＜’+’＜＜a.imag()＜＜’i’＜＜end 1;
return 0;
程序执行后的输出结果是______。
A．6+6i
B．6+1i
C．1+6i
D．1+1i
