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38 lines
815 B
C++
38 lines
815 B
C++
#ifndef _MATHEXP_H_
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#define _MATHEXP_H_
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#include <string>
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#include <stack>
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#include <map>
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//A reusable class that evaluates simple mathematical expressions.
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//Includes variable support - just use setVariable(name, value), and any instance of $name will be replaced with value.
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class MathExp {
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public:
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void setExpression(std::string str);
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void setVariable(std::string name, float val);
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float getVariable(std::string name);
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float eval();
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private:
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//float apply(const char operatorChar, std::string operand);
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void doNextOperation();
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bool isOperator(const char c);
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bool isRParen(const char c);
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int getPrecedence(const char c);
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float strToVal(std::string str);
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std::string mExpression;
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std::stack<float> mOperands;
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std::stack<char> mOperators;
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std::map<std::string, float> mVariables;
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};
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#endif
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