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c2cd94a6f2
1. Fix possibility to write illogical operations. 2. Fix possibility to write multiple '0' when it is not needed. 3. Add scientific notation when result do not fit on screen.
40 lines
1.4 KiB
C++
40 lines
1.4 KiB
C++
// Copyright (c) 2017-2020, Mudita Sp. z.o.o. All rights reserved.
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// For licensing, see https://github.com/mudita/MuditaOS/LICENSE.md
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#pragma once
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#include <string>
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namespace CalculatorConstants
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{
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inline constexpr auto veryLowPrecision = 4;
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inline constexpr auto lowPrecision = 5;
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inline constexpr auto precision = 6;
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inline constexpr auto highPrecision = 8;
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inline constexpr auto expLength = 1;
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inline constexpr auto minusExpLength = 2;
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inline constexpr auto maxStringLength = 7;
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} // namespace CalculatorConstants
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struct Result
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{
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std::string equation;
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std::string value;
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bool isError;
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};
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class Calculator
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{
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/// @param from: string which is going to be replaced
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/// @param to: string which is going to replace the old one
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/// @return: new string with replaced all occurrences of given string to the new one in whole input
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std::string replaceAllOccurrences(std::string input, const std::string &from, const std::string &to);
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std::string prepareEquationForParser(std::string input);
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std::string getValueThatFitsOnScreen(double result);
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long double getCoefficient(double result, uint32_t precision);
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std::string convertToNumberWithPositiveExponent(double result, uint32_t exponent);
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std::string convertToNumberWithNegativeExponent(double result, long long base);
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public:
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Result calculate(std::string source);
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};
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