66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
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#pragma once
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#include <iostream>
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#include <string>
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#include <stack>
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using namespace std;
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class ExpressionManagerInterface
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{
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public:
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ExpressionManagerInterface(){}
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virtual ~ExpressionManagerInterface(){}
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/*
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* Checks whether an expression is balanced on its parentheses
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*
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* - The given expression will have a space between every number or operator
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*
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* @return true if expression is balanced
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* @return false otherwise
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*/
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virtual bool isBalanced(string expression) = 0;
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/**
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* Converts a postfix expression into an infix expression
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* and returns the infix expression.
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*
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* - The given postfix expression will have a space between every number or operator.
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* - The returned infix expression must have a space between every number or operator.
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* - Redundant parentheses are acceptable i.e. ( ( 3 * 4 ) + 5 ).
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* - Check lab requirements for what will be considered invalid.
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*
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* return the string "invalid" if postfixExpression is not a valid postfix expression.
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* otherwise, return the correct infix expression as a string.
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*/
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virtual string postfixToInfix(string postfixExpression) = 0;
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/*
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* Converts an infix expression into a postfix expression
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* and returns the postfix expression
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*
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* - The given infix expression will have a space between every number or operator.
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* - The returned postfix expression must have a space between every number or operator.
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* - Check lab requirements for what will be considered invalid.
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*
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* return the string "invalid" if infixExpression is not a valid infix expression.
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* otherwise, return the correct postfix expression as a string.
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*/
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virtual string infixToPostfix(string infixExpression) = 0;
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/*
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* Evaluates a postfix expression returns the result as a string
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*
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* - The given postfix expression will have a space between every number or operator.
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* - Check lab requirements for what will be considered invalid.
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*
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* return the string "invalid" if postfixExpression is not a valid postfix Expression
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* otherwise, return the correct evaluation as a string
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*/
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virtual string postfixEvaluate(string postfixExpression) = 0;
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};
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