当初为了买房子签合同，自己写了个小程序，主要是为了比较等额法和递减法之间的差价，比较简单，相信战友们都能看懂，于是是upload上来了，有兴趣的看看。-first contract to buy a house that he wrote a small program is to compare the matching law and reduced the difference between the law, relatively simple, I believe his comrades in arms can understand, then upload onto yes, are interested to see.