程序运行结果为______。
#define R 3.0
#define PI 3.1415926
#define L 2*PI*R
#define S PI*R*R
main()
printf("L=%f S=%f\n",L,S);
A.L=18.849556 S=28.274333
B.18.849556=18.849556 28.274333=28.274333
C.L=18.849556 28.274333=28.274333
D.18.849556=18.849556 S=28.274333