圆的周长、面积、表面积、体积、圆柱的体积c的求法

#include
int main()
{
float r, h;

float l, S, b_j, V, y_j;


scanf("%f%f",&r,&h);


l=2*3.14*r;
S=3.14*r*r;
b_j=4*3.14*r*r;
V=3*3.14*r*r*r;
y_j=3.14*r*r*h;


printf("圆的周长: %2.2f\n",l);
printf("圆的面积: %2.2f\n" ,S);
printf("圆的表面积: %2.2f\n", b_j);
printf("圆的体积: %2.2f\n", V);
printf("圆柱的体积: %2.2f\n", y_j);


return 0;


}