单项选择题

有以下程序，输出结果( )。
#include＜iostream＞
using namespace std;
class Complex

public:
Complex(double r=0,double i=0):re(r),im(i)
double real()constreturn re;
double imagoconstreturn 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’＜＜end1;
return 0;

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