error C2228: left of '.y' must have class/struct/union错误大虾指点？

[donkeydonkey]

今天写了个程序编译时出现error C2228: left of '.y' must have class/struct/union错误这个是什么意思？请大虾指点，同种类型的情况我又取编了个小点的程序测试却没有发现错误这是怎么回事？？
愁？谢谢同志们啊！

我用的是vs2005

[ytfrdfiw]

贴代码

[jia_xiaoxin]

如果.y前的类对象是指针对象，或者.y前的对象未定义就会出现这样的问题。
.y前的类对象是指针对象要->y这样使用

[donkeydonkey]

谢谢各位！好像这些都不是给大家看下代码呵
#include "stdafx.h"
#include "conio.h"
#include "math.h"
#include "stdlib.h"
#define MAX_EDGE 500
#define MAX_DATE 500
#define MAX_TRIA 500
long iConvexNum=0;
long DATA_NUM=0;
struct POINT
{ float x;
float y;
};
typedef struct
{ POINT point[3];
}TRIANGLE;
typedef struct
{ POINT EdgePoint1;
POINT EdgePoint2;
}EDGE;
bool TriangleInCircle(float xp, float yp, float x1, float y1, float x2, float y2, float x3, float y3,float *xc, float *yc, float *r)
{
bool Ret;

float eps;
float m1;
float m2;
float mx1;
float mx2;
float my1;
float my2;
float dx;
float dy;
float rsqr;
float drsqr;

eps = 0.000001;
Ret = false;

if (fabs(y1-y2)<eps&&fabs(y2-y3)<eps)
{
return Ret;
}

if ( fabs(y2-y1)<eps )
{
m2=-(x3-x2)/(y3-y2);
mx2=(x2+x3)/2;
my2=(y2+y3)/2;
*xc=(x2+x1)/2;
*yc=m2*(*xc-mx2)+my2;
}
else if ( fabs(y3-y2)<eps )
{
m1=-(x2-x1)/(y2 - y1);
mx1=(x1+x2)/2;
my1=(y1+y2)/2;
*xc=(x3+x2)/2;
*yc= m1 * ((*xc) - mx1) + my1;
}
else
{
m1=-(x2-x1)/(y2-y1);
m2=-(x3-x2)/(y3-y2);
mx1=(x1+x2)/2;
mx2=(x2+x3)/2;
my1=(y1+y2)/2;
my2=(y2+y3)/2;
*xc=(m1*mx1-m2*mx2+my2-my1)/(m1-m2);
*yc=m1*((*xc)-mx1)+my1;
}

dx=x2-(*xc);
dy=y2-(*yc);
rsqr=dx*dx+dy*dy;
*r=sqrt(rsqr);
dx=xp-(*xc);
dy=yp-(*yc);
drsqr=dx*dx+dy*dy;

if (drsqr<= rsqr )
return true;
else
return false;

}
void ConvexHullTriangle(EDGE *Edge,TRIANGLE *Triangle,POINT *Points)
{

long TriNum;
long EdgNum;

for(long i=0;i<iConvexNum;i++)
{
long j=i+1;
long k=i+2;
if(iConvexNum<=3) break;
if(i==iConvexNum-2)
{
k=0;
}
if(i==iConvexNum-1)
{
j=0;
k=1;
}
bool test=true;
for(long r=0;r<iConvexNum;r++)
{
if(r==i||r==j||r==k) continue;

test=TriangleInCircle(Points[r].x ,Points[r].y, Points[i].x, Points[i].y, Points[j].x, Points[j].y, Points[k].x, Points[k].y,float *xc, float *yc, float *r)
if(test==true) break;
}
//如果外接圆不包含凸包上其他点。
if(test==false)
{
//形成三角形，加入三角形数组。
Triangle[TriNum].point[0].x=Points[i].x;
Triangle[TriNum].point[0].y=Points[i].y;
Triangle[TriNum].point[1].x=Points[j].x;
Triangle[TriNum].point[1].y=Points[j].y;
Triangle[TriNum].point[2].x=Points[k].x;
Triangle[TriNum].point[2].y=Points[k].y;
TriNum=TriNum+1;

//加入不重复的边。
if(e==0)
{
Edge[EdgNum+0].EdgePoint1.x=Points[i].x;
Edge[EdgNum+0].EdgePoint1.y=Points[i].y;
Edge[EdgNum+0].EdgePoint2.x=Points[j].x;
Edge[EdgNum+0].EdgePoint2.y=Points[j].y;
Edge[EdgNum+1].EdgePoint1.x=Points[j].x;
Edge[EdgNum+1].EdgePoint1.y=Points[j].y;
Edge[EdgNum+1].EdgePoint2.x=Points[k].x;
Edge[EdgNum+1].EdgePoint2.y=Points[k].y;
Edge[EdgNum+2].EdgePoint1.x=Points[k].x;
Edge[EdgNum+2].EdgePoint1.y=Points[k].y;
Edge[EdgNum+2].EdgePoint2.x=Points[i].x;
Edge[EdgNum+2].EdgePoint2.y=Points[i].y;

EdgNum=EdgNum+3;
}
else

{
Edge[EdgNum].EdgePoint1.x=Points[i].x;
Edge[EdgNum].EdgePoint1.y=Points[i].y;
Edge[EdgNum].EdgePoint2.x=Points[k].x;
Edge[EdgNum].EdgePoint2.y=Points[k].y;

EdgNum=EdgNum+1;

}

// 形成新的凸包数组。
for(long m=j;m<iConvexNum-1;m++)
{
Points[m].x=Points[m+1].x;
Points[m].y=Points[m+1].y;
iConvexNum=iConvexNum-1;
i=-1;
}
}

}



}

int _tmain(int argc, _TCHAR* argv[])
{
POINT *Points;
POINT *POINTS;
Points=new POINT[iConvexNum];
POINTS=new POINT[DATA_NUM];

TRIANGLE *Triangle;
Triangle=new TRIANGLE[MAX_TRI]；
EDGE *Edge;
Edge=new EDGE[MAX_EDGE];
ConvexHullTriangle(Edge,Triangle,Points);
Delaunay_Net(Edge,Triangle,POINTS);
delete[] Points;
delete[] POINTS;
//delete[] Triangle;
// delete[] Edge;

return 0;
}

[The_eagles]

POINT *Points 你这里的Points是个指针啊。
当然是Points[i]->y

[arong2004]

楼上正解！！！！

[chihz3800]

->这个错误我也常犯

[liubuweiright]

语法错误.

[Fighting Horse]

是不是指针，应该写成->

[HelloDan]

代码片段没有，怎么查啊？

[maying_11]

.成员操作符号 他的左边必须是类对象，或结构对象.
我是这么认为的.不知道对不对

[mqiqe]

语法错误.