以下程序中函数f的功能是：当flag为1时，进行由小到大排序；当flag为0时，进行由大到小排序。

#include <stdio.h>

void f(int b[], int n, int flag)

{ 

int i,j,t;

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

for (j=i+1; j<n; j++)

if (flag ? b[i]>b[j] : b[i]<b[j]) 

{ t=b[i]; b[i]=b[j]; b[j]=t; }

}

main()

{ 

int a[10]={5,4,3,2,1,6,7,8,9,10}, i;

f(&a[2], 5, 0); 

f(a, 5, 1); 

for (i=0; i<10; i++) 

printf("%d,", 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.3,4,5,6,7,2,1,8,9,10,

• C.5,4,3,2,1,6,7,8,9,10,

• D.10,9,8,7,6,5,4,3,2,1,