程序源代码:#include<graphics.h>main(){ int driver,mode,i; float j=1,k=1; driver=VGA; mode=VGAHI; initgraph(&driver,&mode,""); setbkcolor(YELLOW); for(i=0;i<=25;i++) { setcolor(8) circle(310,250,k); k=k+j; j=j+0.3; }}