请问为什么会这样

[magicmayu]

#include<alloc.h>
#include<stdio.h>
#include<graphics.h>
#include<conio.h>
int main()
{
int i, gdriver, gmode, size;
void *buf;
gdriver=DETECT;
initgraph(&gdriver, &gmode, "E:\\tc");
setbkcolor(BLUE);
cleardevice();
setcolor(LIGHTRED);
setlinestyle(0,0,1);
setfillstyle(1, 10);
circle(100, 200, 30);
floodfill(100, 200, 12);
size=imagesize(69, 169, 131, 231);
buf=malloc(size);
getimage(69, 169, 131, 231,buf);
putimage(500, 269, buf, COPY_PUT);
for(i=0; i<185; i++){
putimage(70+i, 170, buf, COPY_PUT);
putimage(500-i, 170, buf, COPY_PUT);
}
for(i=0;i<185; i++){
putimage(255-i, 170, buf, COPY_PUT);
putimage(315+i, 170, buf, COPY_PUT);
}
getch();
closegraph();
return 0;
}
以上这段程序在turbo c++ 里运行会出这样的错误

Compiling WORK\TEST.CPP:
Linking TEST.EXE:
Linker Error: Undefined symbol _closegraph in module WORK\TEST.CPP
Linker Error: Undefined symbol _putimage in module WORK\TEST.CPP
Linker Error: Undefined symbol _getimage in module WORK\TEST.CPP
Linker Error: Undefined symbol _imagesize in module WORK\TEST.CPP
Linker Error: Undefined symbol _floodfill in module WORK\TEST.CPP
Linker Error: Undefined symbol _circle in module WORK\TEST.CPP
Linker Error: Undefined symbol _setfillstyle in module WORK\TEST.CPP
Linker Error: Undefined symbol _setlinestyle in module WORK\TEST.CPP
Linker Error: Undefined symbol _setcolor in module WORK\TEST.CPP
Linker Error: Undefined symbol _cleardevice in module WORK\TEST.CPP
Linker Error: Undefined symbol _setbkcolor in module WORK\TEST.CPP
Linker Error: Undefined symbol _initgraph in module WORK\TEST.CPP

不知道为什么？？？

[yoyo82]

我试了怎么没有错。你程序的作用是什么，可以通过，但为什么要用到E盘

[layman2008]

应该在dos下执行吧

[zhangfjj]

Linker Error
链接错误，你找找你的图形库函数文件？？