1、 题目：已知数据文件source.txt中存有20个四位整数, 读取文件中的这些数，然后统计每个四位数各个位上数字是0或2或4或6或8的数的个数,并把这些四位数的个数和这些四位数按从大到小的顺序存入dest.txt文件中。-1, Topic: data files known source.txt in 20 there are four integer, read the document, these few, and then statistics of the various spa