有以下程序

struct S {int n; int a[20];};

void f(struct S *P)

{ int i,j,t;

for(i=0;i<p->n-1;i++)

for(j=i+1;j<p->n;j++)

if(p->a[i]>p->a[j]) { t=p->a[i]; p->a[i]=p->a[j]; p->a[j]=t; }

}

main( )

{ int i; struct S s={10,{2,3,1,6,8,7,5,4,10,9}};

f(&s);

for(i=0;i<s.n;i++) printf("%d",s.a[i]);

}

程序运行后的输出结果是

A)1,2,3,4,5,6,7,8,9,10,

B)10,9,8,7,6,5,4,3,2,1,

C)2,3,1,6,8,7,5,4,10,9,

D)10,9,8,7,6,1,2,3,4,5,