填空题
下列程序对加号进行了重载，划线部分的语句是 【15】 。
# include＜iostream. h＞
# include＜math. h＞
class Triangle
{
int x,y,z;
double area;
public:
Triangle(int i,int j, int k)
{
double s;
x=i;y=j;z=k;
s=(x+y+z)/2.0;
area=sqrt(s*(s-x)*(s-y)*(s-z));
}
void disparea()
{
cout＜＜"Area="＜＜area＜＜endl;
}
friend double operator+(Triangle t1,Triangle t2)
{
______
}
};
void main()
{
Triangle t1(3,4,5),t2(5,12,13);
double s;
cout＜＜"t1:";t1.disparea()
cout＜＜"t2:";t2.disparea()
s=t1+t2;
tout＜＜"总面积:="＜＜s＜＜endl;
}
【参考答案】
return t1.area+t2.area;