Rainbow

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 #include<stdlib.h>

#include<graphics.h>
#include<conio.h>
#include<dos.h>
int main(){
   int gd = DETECT,gm,i,x,y;
   initgraph(&gd,&gm,"c:\\tc\\bgi");
   for (i = 30;i<=200;i++){
       delay(100);
       setcolor(i/10);
     arc(getmaxx()/2,getmaxy()/2,0,180,i);
   }
   getch();
   closegraph();

}

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