一元多项式简易计算器。

中缀多项式计算器，能算浮点数的多位运算，界面友好，有一定容错能力-Polynomial calculator infix can count the floating-point number operation, friendly interface, some fault tolerance

c++完成的多项式计算器，可以完成加法，减法，乘法，求积分等操作-c++ completed polynomial calculator can be completed addition, subtraction, multiplication, integration and other operations