说明：  　交换排序的基本思想都为通过比较两个数的大小，当满足某些条件时对它进行交换从而达到排序的目的。 1.冒泡排序 　　基本思想：比较相邻的两个数，如果前者比后者大，则进行交换。每一轮排序结束，选出一个未排序中最大的数放到数组后面。
(The basic idea of exchange sorting is to achieve the purpose of sorting by comparing the size of two numbers and exchanging them when certain conditions are satisfied. 1. Bubble Sorting Basic idea: Compare two adjacent numbers, if the former is larger than the latter, then exchange. At the end of each round of sorting, select the largest unsorted number and put it after the array.)