This blog is used to create articles which contains solutions to problems in terms of programming. In this blog, I do not discuss only one of the programming as a whole, but in this blog I will write various kinds of problems that are often encountered in learning a programming language. So I apologize if any of my articles do not discuss any of the programming language as a whole. And I hope you make a donation to me as a reward for my hard work to write these articles. Each article in this blog may be duplicated, but please specify the source. Please respect my hard work in developing this blog.