实现各种进制转换，产生随机数。产生随机数的函数，返回值类型为 Long 数组，下标从零开始。注意：随机位数最多为9！注意 任何数据类型的数组都需要 20 个字节的内存空间，加上每一数组维数占 4 个字节，再加上数据本身所占用的空间。数据所占用的内存空间可以用数据元数目乘上每个元素的大小加以计算。例如，以 4 个 2 字节之 Integer 数据元所组成的一维数组中的数据，占 8 个字节。这 8 个字节加上额外的 24 个字节，使得这个数组所需总内存空间为 32 个字节。-Achieve a variety of binary conversion, to generate random numbers. A function of the random number, the type of the return value Long array subscr ipt from scratch. Note: random digit up to 9! Note that the array of any data type requires 20 bytes of memory space, plus each array dimension is four bytes, plus the space occupied by the data itself. The memory space occupied by the data can be multiplied by the number of data elements on the size of each element to be calculated. For example, the one-dimensional array consisting of four 2-byte Integer data element in the data, accounting for 8 bytes. Eight bytes plus an additional 24 bytes, so this array to the total memory space required for the 32 bytes.