将大数看作一个n进制数组，对于目前的32位系统而言n可以取值为2的32次方，即0x10000000，

假如将一个1024位的大数转化成0x10000000进制，它就变成了32位，而每一位的取值范围就不是0-1

或0-9，而是0-0xffffffff。我们正好可以用一个无符号长整数来表示这一数值。所以1024位的大数

就是一个有32个元素的unsigned long数组。而且0x100000000进制的数组排列与2进制流对于计算机

来说，实际上是一回事，但是我们完全可以针对unsigned long数组进行“竖式计算”，而循环规模

被降低到了32次之内，并且算法很容易理解。-Will be large numbers as a n-band array, on the current 32-bit systems can n value of 2 32-th power, that is 0x10000000, if a 1024 large numbers into hexadecimal 0x10000000, it changed became 32, and each range is not 0-1 or 0-9, but 0-0xffffffff. We just can use a unsigned long integer to express this value. Therefore, large numbers of 1024 is a 32 element array of unsigned long. 0x100000000 hex array and array with 2-band flow for the computer, the fact is one thing, but we can be an array of unsigned long for a　vertical calculation , and circle size was reduced to 32 times, the algorithm and it is easy to understand.