Trying to run simple graphics program in c using command prompt - c

Question

This is the following program.
#include <graphics.h>
int main(void)
{
drawRect(50,100,200,150);
drawLine(50,100,150,25);
drawLine(150,25,250,100);
drawRect(130,190,40,60);
drawRect(70,195,40,30);
drawRect(190,195,40,30);
drawRect(70,125,40,30);
drawRect(190,125,40,30);
return 0;
}
and following is the error
C:\Users\Balavardhan\Desktop\New folder\c language>gcc z.c -o z.exe
z.c: In function 'main':
z.c:4:6: warning: implicit declaration of function 'drawRect'; did you mean 'drawpoly'? [-Wimplicit-function-declaration]
drawRect(50,100,200,150);
^~~~~~~~
drawpoly
z.c:5:6: warning: implicit declaration of function 'drawLine'; did you mean 'drawpoly'? [-Wimplicit-function-declaration]
drawLine(50,100,150,25);
^~~~~~~~
drawpoly
C:\Users\BALAVA~1\AppData\Local\Temp\ccMnl0ZM.o:z.c:(.text+0x2e): undefined reference to `drawRect'
C:\Users\BALAVA~1\AppData\Local\Temp\ccMnl0ZM.o:z.c:(.text+0x52): undefined reference to `drawLine'
C:\Users\BALAVA~1\AppData\Local\Temp\ccMnl0ZM.o:z.c:(.text+0x76): undefined reference to `drawLine'
C:\Users\BALAVA~1\AppData\Local\Temp\ccMnl0ZM.o:z.c:(.text+0x9a): undefined reference to `drawRect'
C:\Users\BALAVA~1\AppData\Local\Temp\ccMnl0ZM.o:z.c:(.text+0xbe): undefined reference to `drawRect'
C:\Users\BALAVA~1\AppData\Local\Temp\ccMnl0ZM.o:z.c:(.text+0xe2): undefined reference to `drawRect'
C:\Users\BALAVA~1\AppData\Local\Temp\ccMnl0ZM.o:z.c:(.text+0x106): undefined reference to `drawRect'
C:\Users\BALAVA~1\AppData\Local\Temp\ccMnl0ZM.o:z.c:(.text+0x12a): undefined reference to `drawRect'
collect2.exe: error: ld returned 1 exit status
Can anyone tell me how can I solve this problem?