用c解决小的计算题

#include
int main()
{
 double r, H;
 double l ,s, s_b ,v ,v_z;
 scanf("%lf",&r);
 scanf("%lf",&H); 
 l=2*3.14*r;
 printf("圆的周长是 %lf\n",l);
 s=r*r*3.14;
 printf("圆的面积是 %lf\n",s);
 s_b=4*3.14*r*r;
 printf("球的表面积 %lf\n",s_b);
 v=4/3*3.14*r*r*r;
 printf("球的体积 %lf\n",v);
 v_z=r*r*3.14* H;
 printf("圆柱的体积 %lf\n",v_z);
 return 0;
}