Introduction - If you have any usage issues, please Google them yourself
Expression evaluation: in infix expression to a floating point number to the mix operator, respectively, to achieve: convert postfix expression and then evaluated infix expression evaluation are two evaluation algorithms implemented in two methods. The expression contains operators: addition+, subtraction-, multiplication*, division /, parentheses (), involution#, and other operators. Operator precedence and associativity of the mathematical algorithm. For example: the command-line input (-2.0)+ (1.0+2.0)* 3.0-2.0# 2.0 Enter
(1) infix expression output:
(-2.0)+ (1.0+2.0)* 3.0-2.0# 2.0 = 3.0
(2) postfix expression output:
-2.0 1.0 2.0+ 3.0*+ 2.0 2.0-
(-2.0)+ (1.0+2.0)* 3.0-2.0# 2.0 = 3.0