这是一个基于表达式的科学计算器，计算结果的有效位较长（16位）；支持不严格的表达式输入（如cos(23)*sin(34)与cos(23)*sin(34与cos23*sin34等价）；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），功能非常不错。-This is a formula based on the scientific calculator, the results effectively place a longer period (16); Support rigorous expression input (such as cos (23)* sin (34) and cos (23)* sin (34 with the equivalent sin34 cos23*); support for the four band in a few expressions while the band mixed computing (except for the metric system outside the band is not limited to a few integers, as 12d.3axh, xh I kind of calculation can identify the hexadecimal number identifier); the program also doing fine (as produced by the mouse and keyboard , the window to follow the history of computing View), which is very good.