编写程序实现输入整数n，输出如下所示由数字组成的菱形。

输入4×4的数组，编写程序实现：

（1）求出对角线上各元素的和；

（2）求出对角线上行、列下标均为偶数的各元素的积；

（3）找出对角线上其值最大的元素和它在数组中的位置。

用递归法将一个整数n转换成字符串。例如，输入483，应输出字符串“483”。n的位数不确定，可以是任意位数的整

有一字符串，包含n个字符。写一函数，将此字符串中从第m个字符开始的全部字符复制成为另一个字符串。

-Write a program to input integer n, the output is shown below the diamond by the numbers. Input array 44, the preparation of the program: (1) find the diagonal elements　(2) find the diagonal up, the column subscr ipt are an even number of elements of the plot　(3) find its value on the diagonal elements and its location in the array. An integer n using recursive method to convert a string. For example, enter 483, you should output the string " 483" . the median uncertainty in n can be any digit whole there is a string containing n characters. Write a function to copy from the first m characters of all the characters in this string into another string.