计算器的完整VB工程，可以计算表达式结果，平方＾2，平方根＾1/2,乘*，除/,三角函数用弧度如sin(30)表达式为sin(30*3.14159/180，-Calculator complete VB project, the results can be calculated expression, square ^ 2, the square root of ^ 1/2, multiplication*, division /, trigonometric functions in radians, such as sin (30) expression is sin (30* 3.14159/180,