程序代码：

#include <stdio.h>
//定义指针变量
int * p = NULL;
int mian(){
    //定义并初始化数组
    int arr[3][4] = {
        {1,2,3,4},
        {5,6,7,8},
        {2,7,9,5},
    };
    p = * arr;
    /** 指针指向推导 **/
    /**
     *  p = arr => p = &arr[0]
     *  p = * arr => p = &(&arr[0][0])
     * 
     *  =>表示“等价于”
    */
    return 0;
}