下面的程序使用了函数指针，其运行结果是______。 #include＜stdio.h＞#include＜math.h＞intf1(inta){returna*a;}intf2(inta){returna*a*a;}voidmain(){intx=3,y1,y2,y3,y4;f=f1;y1=(*f)(x);y2=f1(x);f=f2;y3=f(x);y4=f2(x);printf("y1=%d,y2=%d,y3=%d,y4=%d\n",y1,y2,y3,y4);}
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
正确答案是B