它是在DOS环境下开发的数学计算软件，菜单中主要的一种是“有限元法”，使用的编程语言是C语言，解压无需密码。-It is the DOS environment to develop a mathematical calculation software, the main menu is a "finite element method", the use of the C programming language is the language, extract no p

c语言DOS界面菜单式四则运算，实现了简单的加减乘除。-c language menu-driven DOS interface, arithmetic, multiplication and division to achieve a simple addition and subtraction.