说明：  一个VB计算器源码，具有科学计算器和标准计算器两种模式，点击主菜单上的对应菜单项可实现两种功能间的切换。标准计算器主要完成常规加减乘除数字计算，科学计算器除了完成上述功能，还可以进行弧度、角度、梯度、平方、正切、平方根的运算，里面的算法也是值得学习的。
(A calculator VB source, a scientific calculator and standard calculator modes, click on the corresponding menu item on the main menu enables switching between the two functions. Standard Math Calculator mainly to complete regular basis, in addition to the above function scientific calculator, you can also radian angle, gradient, square, tangent, calculation algorithms inside the square root is worth learning.)