Task Description

Relevant Knowledge

Programming Requirements

Test Instructions

Task Description

In this task: Calculate the result of a Postfix Expression.

Relevant Knowledge

Postfix expression, also known as Reverse Polish Notation $($RPN$),$ refers to an expression that does not contain parentheses, with operators placed after their operands. All calculations are strictly performed from left to right in the order of appearance of operators $($without considering the priority rules of operators$).$

You can use stack to implement the problem. You can view all the functions related to the stack in the sqstack.h file.Such as Push,Pop and so on$.$

Programming Requirements

Based on the prompts, complete the code in the right$-$side editor. int evaluatePostfixExpression$($const char$*$ expression$)//$Calculate the result

Test Instructions

The platform will test the code you've written:

Test Input:

$23+4**82-\frac{3}{+}$

Expected Output:

#include $\})$

$(",$ result$\{$