菜鸟c++有错，跪求大神

Question

#include

class fushu
{
double r,s;
public:
fushu(double x,double y)
{
r=x;
s=y;
}
fushu()
{
double x,double y;
printf("请分别输入实数和虚数的值：");
scanf("%lf%lf",&x,&y);
r=x;
s=y;
}
fushu operator+(fushu &a)
{
fushu t;
t.r=r+a.r;
t.s=s+a.s;
return t;
}

fushu operator-(fushu &a)
{
    fushu t;
    t.r=r-a.r;
    t.s=s-a.s;
    return t;
}
void print()
{
    printf("%lf+%lfi\n",r,s);
}

};

int main()
{
fushu F1,F2,F3(0.0,0.0),F4(0.0,0.0);
F3=F1+F2;
F4=F1-F2;
F3.print();
F4.print();

return 0;

}

为什么我这个函数F3和F4对象调用的也是默认的构造函数？
怎样才能让它调用那个有参的构造函数

Answer 1

fushu operator-(fushu &a)
{
fushu t;
。。。
}
你在这又声明了一个对象，可不得重新构造嘛