57 lines
1.3 KiB
C++
57 lines
1.3 KiB
C++
#include <string>
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#include <iostream>
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using std::string;
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const char* smallNumbers[] = {
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"zero", "one", "two", "three", "four", "five",
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"six", "seven", "eight", "nine", "ten",
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"eleven", "twelve", "thirteen", "fourteen", "fifteen",
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"sixteen", "seventeen", "eighteen", "nineteen"
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};
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string spellHundreds(unsigned n) {
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string res;
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if (n > 99) {
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res = smallNumbers[n/100];
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res += " hundred";
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n %= 100;
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if (n) res += " and ";
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}
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if (n >= 20) {
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static const char* Decades[] = {
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"", "", "twenty", "thirty", "forty",
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"fifty", "sixty", "seventy", "eighty", "ninety"
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};
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res += Decades[n/10];
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n %= 10;
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if (n) res += "-";
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}
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if (n < 20 && n > 0)
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res += smallNumbers[n];
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return res;
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}
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const char* thousandPowers[] = {
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" billion", " million", " thousand", "" };
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typedef unsigned long Spellable;
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string spell(Spellable n) {
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if (n < 20) return smallNumbers[n];
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string res;
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const char** pScaleName = thousandPowers;
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Spellable scaleFactor = 1000000000;// 1 billion
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while (scaleFactor > 0) {
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if (n >= scaleFactor) {
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Spellable h = n / scaleFactor;
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res += spellHundreds(h) + *pScaleName;
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n %= scaleFactor;
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if (n) res += " ";
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}
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scaleFactor /= 1000;
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++pScaleName;
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}
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return res;
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}
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