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#include <iostream>
#include <string>
using namespace std;
int getNum();
void getDigits(int num, int digits[]);
void printWordsForNum(int digits[]);
int main()
{
int num, digits[3];
while(true){ // Keep looping endlessly; could use 1 instead of 'true'
num = getNum();
if(num < 0) // User said to stop
return 1; // End loop, end program
getDigits(num, digits);
printWordsForNum(digits);
}
}
int getNum()
{
int num;
cout << "Enter integer (0 to 999; -1 to quit): ";
cin >> num;
return num;
}
void getDigits(int num, int digits[3])
{
int i;
for(i = 2; i >= 0; --i){
digits[i] = num % 10;
num /= 10;
}
}
void printWordsForNum(int digits[3])
{
string
units[10] = {"zero","one","two","three","four","five","six","seven",
"eight","nine"},
teens[10] = {"ten","eleven","twelve","thirteen","fourteen","fifteen",
"sixteen", "seventeen","eighteen","nineteen"},
tens[10] = {"","","twenty","thirty","forty","fifty","sixty","seventy",
"eighty","ninety"};
if(digits[0] > 0){ // Example: 276
cout << "\n" << units[digits[0]] << " hundred"; // 'two hundred '
if(digits[1] + digits[2] > 0)
cout << " and "; // ' and '
}
if(digits[1] > 1)
cout << tens[digits[1]] << " "; // 'seventy '
if(digits[1] == 1)
cout << teens[digits[2]] << "\n\n";
else
if(digits[2] > 0 || digits[0] + digits[1] == 0)
cout << units[digits[2]] << "\n\n"; // 'six'
else
cout << "\n\n";
}
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