c - conio setcolor(BLACK) not working -

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the method setcolor(black) not working on white background. if background color black , setcolor(white) displays circle border correctly. doesn't happen other color.

#include<graphics.h> #include<conio.h> void main() {     int gd=detect,gm;     initgraph(&gd,&gm,"c:\\tc\\bin");     setbkcolor(white);     setcolor(black);     circle(100,100,50);     getch();     closegraph(); }


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