Answer:
Hope this works
#include <iostream>
#include <string>
#include <vector>
using namespace std;
string digitName(int digit);
string teenName(int number);
string tensName(int number);
string intName(int number);
vector<string> ones {"","one", "two", "three", "four", "five", "six", "seven", "eight", "nine"};
vector<string> teens {"ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen","sixteen", "seventeen", "eighteen", "nineteen"};
vector<string> tens {"", "", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"};
string nameForNumber (long number) {
if (number < 10) {
return ones[number];
} else if (number < 20) {
return teens [number - 10];
} else if (number < 100) {
return tens[number / 10] + ((number % 10 != 0) ? " " + nameForNumber(number % 10) : "");
} else if (number < 1000) {
return nameForNumber(number / 100) + " hundred" + ((number % 100 != 0) ? " " + nameForNumber(number % 100) : "");
} else if (number < 1000000) {
return nameForNumber(number / 1000) + " thousand" + ((number % 1000 != 0) ? " " + nameForNumber(number % 1000) : "");
} else if (number < 1000000000) {
return nameForNumber(number / 1000000) + " million" + ((number % 1000000 != 0) ? " " + nameForNumber(number % 1000000) : "");
} else if (number < 999000000001) {
return nameForNumber(number / 1000000000) + " billion" + ((number % 1000000000 != 0) ? " " + nameForNumber(number % 1000000000) : "");
}
return "error";
}
int main()
{
long input;
do
{
cout << "Please enter a positive integer: ";
cin >> input;
cout << "\\" << nameForNumber(input) << endl;
cout << "\\\\" << endl;
}while (input > 0);
return 0;
}