有以下程序
void f(int *x,int *y)
int t;
t=*x;*x=*y;*y=t;

main()
int a[8]=1,2,3,4,5,6,7,8,i,*p,*q;
p=a;q=＆a[7];
while(p
f(p,q);p++; q--;
for(i=0;i＜8;i++)printf("%d,",a[i]);

程序运行后的输出结果是______。

A．8,2,3,4,5,6,7,1,

B．5,6,7,8,1,2,3,4,

C．1,2,3,4,5,6,7,8,

D．8,7,6,5,4,3,2,1,