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December 29, 2017 20:21
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Code to convert Roman Numerals to Decimals. (RN2DEC created by ButchDean72 - https://repl.it/@ButchDean72/RN2DEC)
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| #include <cstdio> | |
| #include <unordered_map> | |
| #include <vector> | |
| #include <cstring> | |
| #include <memory> | |
| const std::string sample = "MCMLXXII"; | |
| struct ROMAN_NUMERALS | |
| { | |
| char letter; | |
| int value; | |
| }; | |
| class CRNBase | |
| { | |
| public: | |
| CRNBase(){} | |
| virtual ~CRNBase(){} | |
| protected: | |
| unsigned int FetchRNValue(const char c) const; | |
| private: | |
| std::unordered_map<char, unsigned int> rnValsHash = {{'M', 1000}, {'D', 500}, {'C', 100}, {'L', 50}, {'X', 10}, {'V', 5}, {'I', 1}}; | |
| }; | |
| unsigned int CRNBase::FetchRNValue(const char c) const | |
| { | |
| std::unordered_map<char, unsigned int>::const_iterator itr = rnValsHash.find(c); | |
| if(itr == rnValsHash.end()) | |
| return 0; | |
| return itr->second; | |
| } | |
| class CRN2Dec : public CRNBase | |
| { | |
| public: | |
| CRN2Dec(){} | |
| ~CRN2Dec(){} | |
| unsigned int DecValue(std::string rnStr); | |
| private: | |
| std::vector<int> values; | |
| }; | |
| unsigned int CRN2Dec::DecValue(std::string rnStr) | |
| { | |
| int total = 0, current = 0; | |
| for(std::string::iterator i = rnStr.begin(); i != rnStr.end(); ++i) | |
| { | |
| current = FetchRNValue(*i); | |
| if(values.empty()) | |
| { | |
| values.push_back(current); | |
| continue; | |
| } | |
| if(current > values[values.size() - 1]) | |
| { | |
| values[values.size() - 1] = current - values[values.size() - 1]; | |
| } | |
| else | |
| { | |
| values.push_back(current); | |
| } | |
| } | |
| for(int j = 0; j != values.size(); ++j) | |
| { | |
| total += values[j]; | |
| } | |
| return total; | |
| } | |
| int main() | |
| { | |
| std::unique_ptr<CRN2Dec> rn2d(new CRN2Dec()); | |
| std::printf("Decimal for %s is %d\n", sample.c_str(), rn2d->DecValue(sample)); | |
| return 0; | |
| } |
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