[单选题]

程序运行结果为______。#define R 3.0#define PI 3.1415926#define L 2PIR#define S PIRRmain(){ 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

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