下面的程序使用了函数指针,其运行结果是______。<br/>include<stdio.h>include<math.h>int f1(int a){return a*a;}int f2(int a){return a*a*a;}void main(){int x=3,y1,y2,y3,y4;f=f1;y1=(*f)(x);y2=f1(x);f=f2;y3=f(x);y4=f2(x);pri
A.y1=27,y2=9,y3=9,y4=27 B.y1=9,y2=9,y3=27,y4=27 C.y1=9,y2=27,y3=9,y4=27 D.y1=27,y2=27,y3=9,y4=9