81 lines
1.6 KiB
C++
81 lines
1.6 KiB
C++
#include "say.h"
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#include <stdexcept>
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#include <unordered_map>
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namespace say {
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using namespace std;
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namespace {
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const unordered_map<number_t, string> number_map = {
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{0, "zero"},
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{1, "one"},
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{2, "two"},
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{3, "three"},
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{4, "four"},
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{5, "five"},
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{6, "six"},
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{7, "seven"},
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{8, "eight"},
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{9, "nine"},
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{10, "ten"},
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{11, "eleven"},
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{12, "twelve"},
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{13, "thirteen"},
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{20, "twenty"},
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{30, "thirty"},
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{40, "forty"},
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{50, "fifty"},
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{80, "eighty"}
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};
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struct order_t
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{
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number_t divisor;
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number_t max;
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string separator;
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string suffix;
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};
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const order_t orders[] = {
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{10, 100, "-", "ty"},
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{100, 1000, " ", " hundred"},
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{1000, 1000000, " ", " thousand"},
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{1000000, 1000000000, " ", " million"},
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{1000000000, 1000000000000, " ", " billion"}
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};
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}
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string in_english(number_t number)
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{
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if (number_map.count(number))
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return number_map.at(number);
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if (number > 13 && number < 20)
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return number_map.at(number - 10) + "teen";
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for (auto o : orders) {
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if (number >= o.divisor && number < o.max) {
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if (number % o.divisor == 0)
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return in_english(number / o.divisor) + o.suffix;
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number_t reminder = number % o.divisor;
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number_t div_part = number - reminder;
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return in_english(div_part) + o.separator + in_english(reminder);
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}
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}
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throw domain_error("can't say the number");
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}
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}
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