#include "math.h"
void main()
{
int R=30;
int i,j;
for(i=0;i<=2*R;i++)
for(j=0;j<=2*R;j++)
if(j==ceil(R-sqrt(R*R-(i-R)*(i-R)))||j==ceil(R+sqrt(R*R-(i-R)*(i-R))))
printf("*");
}
else
printf(" ");
printf("\n");
} 妳看看這個如何?不合適我再改