C++中expected initializer before '.' token怎么办？ 实在找不到了完整代码#include<iostream>#include<math.h>using namespace std;class Location{ public: void setX(int a) { x=a; } void setY(int b) { y=b; } int getX() { return x; } int getY() { return y; } double distance(Location &A,Location &B); private: int x,y;};double Location::distance(Location &A,Location &B){ double sum=sqrt((A.x-B.x)*(A.x-B.x)+(A.y-B.y)*(A.y-B.y)); return sum; cout<<"Diatance1="<<sum<<endl;}int main(){ Location A,B; void A.setX(-10); void A.setY(-20); void B.setX(-40); void B.setY(60); cout<<"A("<<A.getX()<<","<<A.getY()<<")"<<","<<"B("<<B.getX()<<","<<B.getY()<<")"<<endl; double distance(Location A,Location B); return 0;}