76 lines
1.5 KiB
C++
76 lines
1.5 KiB
C++
#include <iostream>
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#include <unordered_map>
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using namespace std;
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string intToRoman(int num)
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{
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// Define the symbols and their corresponding values
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unordered_map<int, string> symbol_map = {
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{1000, "M"},
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{900, "CM"},
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{500, "D"},
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{400, "CD"},
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{100, "C"},
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{90, "XC"},
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{50, "L"},
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{40, "XL"},
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{10, "X"},
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{9, "IX"},
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{5, "V"},
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{4, "IV"},
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{1, "I"}};
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// Build the Roman numeral string
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string roman = "";
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for (auto &[value, symbol] : symbol_map)
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{
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while (num >= value)
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{
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roman += symbol;
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num -= value;
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}
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}
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return roman;
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}
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int romanToInt(string s)
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{
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// Define the symbols and their corresponding values
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unordered_map<char, int> symbol_map = {
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{'M', 1000},
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{'D', 500},
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{'C', 100},
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{'L', 50},
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{'X', 10},
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{'V', 5},
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{'I', 1}};
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// Calculate the integer value
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int value = 0;
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for (int i = 0; i < s.length(); i++)
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{
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if (i > 0 && symbol_map[s[i]] > symbol_map[s[i - 1]])
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{
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value += symbol_map[s[i]] - 2 * symbol_map[s[i - 1]];
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}
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else
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{
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value += symbol_map[s[i]];
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}
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}
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return value;
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}
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int main()
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{
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int num = 1234;
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string roman = intToRoman(num);
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cout << num << " in Roman numerals is " << roman << endl;
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string s = "MCCXXXIV";
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int value = romanToInt(s);
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cout << s << " in integer value is " << value << endl;
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return 0;
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} |