以下程序的输出结果为
mAin( )
int m=7,n=4;
FloAt A=38.4,B=6.4,x;
x=m/2+n*A/B+1/2;
Cout＜＜x＜＜EnDl;
A．27.000000
B．27.500000
C．28.000000
D．28.500000