'grOK' : undeclared identifier 求解
#include<graphics.h>
#include<stdlib.h>
#include<stdio.h>
#include<conio.h>

int main(void)
{
//select a driver and mode that supports
//multiple drawing colors
int gdriver=EGA,gmode=EGAHI, errorcode;
int color, maxcolor, x, y;
char msg[80];

//initialize graphics and local variables
initgraph(&gdriver, &gmode," ");

//read resule of initiazation
errorcode=graphresult();
if (errorcode!= grOK)
{
printf("Graphics error:%s\n", grapherrormsg(errorcode));
printf("Press and key to halt:");
getch();
exit(1);
//terminate with an error code
}
//maxinum color index supported
maxcolor=getmaxcolor();

//for centering text message
settextjustify(CENTER_TEXT,CENTER_TEXT);
x=getmaxx()/2;
y=getmaxy()/2;

//loop through the available colors
for (color=1; color<=maxcolor; color++)
{
//clear the screen
cleardevice();

//select a new background color
setcolor(color);

//output a message
sprintf(msg,"Color:%d",color);
outtextxy(x,y,msg);
getch();
}
//clean up
closegraph();
return 0;
}
编译是为什么显示'grOK' : undeclared identifier

[解决办法]
这个TC下的代码啊。。。
[解决办法]
#include<graphics.h>
搜索一下这个文件里有没有定义grOk，没有的话更新一下这个文件吧。
[解决办法]
VC就建一个MFC对话框程序，然后在OnPaint里面修改绘制内容。
CPaintDC dc; dc.MoveTo(0,0); dc.LineTo(100,100);
[解决办法]
http://www.easyx.cn
[解决办法]