Thread: Problem with BGI graphics: Linker Error

Hey. I had just started work on a certain BGI graphics mini project, when I discovered a totally new problem. Whenever I try to compile the program below, it gets compiled with no errors and no warnings. However, when I try to run the program, I get linker errors related to each of the functions defined in graphics.h

Code:

#include<iostream.h>
#include<conio.h>
#include<graphics.h>
#include<math.h>
#define XINTERVAL 100
/////////////////////////////////////////////////////////////////////
void showgraph()
{
	int gd=DETECT,gm,currentx,ctr,ctr2;
	clrscr();
	initgraph(&gd,&gm,"c:\\tc\\bgi");

	cleardevice();
	moveto(1,1);
	currentx=1;
	setcolor(BLUE);

	ctr2=0;
	ctr=1;
	while(getx()<=getmaxx())
	{
		line(currentx,1,currentx,getmaxy());
		ctr++;
		currentx=XINTERVAL*ctr2+log10(ctr)*XINTERVAL;
		if(ctr==10)
		{
			ctr=1;
			ctr2++;
		}
	}

	getch();

	closegraph();
	restorecrtmode();
}
/////////////////////////////////////////////////////////////////////
int main()
{
	clrscr();
	showgraph();
	getch();
	return(0);
}

The program seems simple enough, so I am unable to understand why I should get any errors at all. The problem is that I am writing a BGI graphics program after a very long time, and did not anticipate any problem. Moreover, programs that I had earlier written and compiled correctly, now give me the same errors when I try to run them from within the compiler. What could be the problem? Please help out.

Compiler: Turbo C++ v3.0
OS: Microsoft Windows XP, Home Edition, Version 2002, Service Pack 2
Computer: AMD Athlon XP 2000+, 1.66 GHz, 224 MB RAM