说明：  编程求出二维数组中的最大和最小元素的值及其位置。设二维数组如下： A={ { 3,13,7,9},{11,8,23,5},{6,34,16,4}}。
(programming calculated two-dimensional array of elements in the largest and smallest values and its location. Two-dimensional arrays located as follows : A = () (3,13,7,9, 11,8,23,5 (), (6,34,16, 4).)