C++: postfix expression evaluation
Postfix expressions, also known as reverse Polish expressions, are mathematical expressions that can be calculated without parentheses. In computer science, postfix expressions are widely used in the implementation of stack data structures.
In this article, we will implement postfix expression evaluation in C++ code and explain how it works.
The basic idea of suffix expression evaluation is: scan the expression from left to right, if it encounters a number, it will be pushed onto the stack; if it encounters an operator, pop up two numbers for calculation, and then push the result onto the stack. The resulting top element of the stack is the value of the expression.
The following is the complete C++ code implementation:
#include<iostream>
#include<stack>
#include<string>
using