程序代码：

#include<stdio.h>
void change(int *p)
{
    int i, j, temp;
    int *pmax, *pmin;
    pmax = p;
    pmin = p;
    for(i=0;i<5;i++)
        for (j = 0; j < 5; j++)
        {
            if (*pmax < *(p + 5 * i + j))
                pmax = p + 5 * i + j;
            if (*pmin > *(p + 5 * i + j))
                pmin = p + 5 * i + j;
        }
    temp = *(p + 12);
    *(p + 12) = *pmax;
    *pmax = temp;
    temp = *p;
    *p = *pmin;
    *pmin = temp;
    pmin = p + 1;
    for (i = 0; i < 5; i++)
        for (j = 0; j < 5; j++)
            if ((*(p + 5 * i + j) > *p) && (*pmin > *(p + 5 * i + j)))
                pmin = p + 5 * i + j;
    temp = *pmin;
    *pmin = *(p + 4);
    *(p + 4) = temp;
    pmin = p + 1;
    for (i = 0; i < 5; i++)
        for (j = 0; j < 5; j++)
            if ((*(p + 5 * i + j) > *(p + 4)) && (*pmin > *(p + 5 * i + j)))
                pmin = p + 5 * i + j;
    temp = *pmin;
    *pmin = *(p + 20);
    *(p + 20) = temp;
    pmin = p + 1;
    for (i = 0; i < 5; i++)
        for (j = 0; j < 5; j++)
            if ((*(p + 5 * i + j) > *(p + 20)) && (*pmin > *(p + 5 * i + j)))
                pmin = p + 5 * i + j;
    temp = *pmin;
    *pmin = *(p + 24);
    *(p + 24) = temp;
}

int main()
{
    void change(int *p);
    int a[5][5] = { {0,1,2,3,4},{5,6,7,8,9},{10,11,12,13,14},{15,16,17,18,19},{20,21,22,23,24} };
    int i, j;
    int *p;
    p = &a[0][0];
    change(p);
    for (i = 0; i < 5; i++)
    {
        for (j = 0; j < 5; j++)
            printf("%5d", a[i][j]);
        printf("\n");
    }
    return 0;
}