一个基于表达式求值的科学计算器，C++，MFC，支持四种进制的数在一个表达式中同时出现的进制混合运算（除十进制外的各进制数不限于整数，如12d.3axh，xh是我的计算类所能识别的十六进制数的标识符）；且程序做得也比较精细（如制作了鼠标键盘、窗口跟随、计算历史查看等）。-Expression based on the evaluation of the scientific calculator, C++, MFC, in support of a number of four-band expression in a binary mixture at the same time, the operator (in addition to the band outside the metric system is not limited to an integer number, such as the 12d. 3axh, xh is the type of calculation I can identify the number of hexadecimal identifier)　and procedures are also doing fine (for example, has produced a mouse keyboard, the window to follow to calculate the historical view, etc.).