ช่วยหน่อยครับ

มันติด 0.00ทุกตัวเลย แล้วก็ช่วยอธิบายเหตุผลให้รู้ด้วยได้ไหมครับ

#include<stdio.h>
#include<stdlib.h>
int main()
{
float r,circumference,area,volume,surface;
printf("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
printf("\n****************************Program Circle******************************* \n");
printf("Please input radius : ");
scanf("%f",&r);
printf("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++");
circumference=2*3.14*r
; area=3.14*r*r
; volume=(4/3)*3.14*r*r*r
; surface=4*3.14*r*r
; printf("\nCircumference is %.2f \n",&circumference);
; printf("Circle area is %.2f \n",&area);
; printf("Volume of sphere is %.2f \n",&volume);
; printf("Surface area of a sphere is %.2f",&surface);
; printf("\n++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\n");
system("pause");
}