Description
Homework 5 Project 1
* Design a class Numbers that can be used to translate whole dollar
* amounts in the range of 0 through 9999 into an English description
* of the number.
*
* Algorithm:
* 1. Accept input from user. Validate that number is between 0 and 9999
* 2. Determine how many digits the number has
* 3. Using the number of digits, select the most significant digit and
* output it in English
* 4. Remove the most significant digit to move place value lower
* 5. Continue to determine the most significant digit, display it
* in English, and lower the place value until the number is less than
* 20
*/
#include <iostream>
using namespace std;
class Number
{
private:
int number;
public:
Number(int);
const static string LESSTHAN20[];
const static string TENS[];
const static string HUNDRED;
const static string THOUSAND;
int getNumber();
int parseDigits(int);
void print();
};
Number::Number(int n)
{
number = n;
}
const string Number::LESSTHAN20[] = { “zero”, “one”, “two”, “three”, “four”, “five”, “six”, “seven”, “eight”, “nine”, “ten”,
“eleven”, “twelve”, “thirteen”, “fourteen”, “fifteen”, “sixteen”, “seventeen”,
“eighteen”, “nineteen” };
const string Number::TENS[] = { “twenty”, “thrity”, “forty”, “fifty”, “sixty”, “seventy”, “eighty”, “ninety” };
const string Number::HUNDRED = “hundred”;
const string Number::THOUSAND = “thousand”;
int Number::getNumber()
{
return number;
}
/**
* Count the number of digits in the numeral provided
*/
int Number::parseDigits(int num)
{
return floor(log10(num) + 1);
}
void Number::print()
{
int digits = parseDigits(number);
int msd = 0;
// Using the number of digits to deterime where to start dividing
// by the highest place value
switch (digits)
{
case 4:
msd = number / 1000; // Determine value of most significant digit
cout << LESSTHAN20[msd];
cout << ” ” << THOUSAND << ” “;
case 3:
number = number % 1000; // as the code falls through,
// need to chop off the previous most significant digit
msd = number / 100; // Determine value of most significant digit
cout << LESSTHAN20[msd];
cout << ” ” << HUNDRED << ” “;
default:
number = number % 100; // chop off previous msd
if (number < 20)
{
cout << LESSTHAN20[number] << endl;
} else
{
msd = number / 10; // Determine value of most significant digit
cout << TENS[msd – 2];
cout << ” ” << LESSTHAN20[number % 10] << endl;
}
}
}
int inputNumber();
int main()
{
Number n(inputNumber());
n.print();
return 0;
}
int inputNumber()
{
int num;
bool validInput = false;
cout << “Enter a number between 0 and 9999:\n”;
cin >> num;
while (!validInput) {
if (num < 0 || num > 9999) {
cout << “Invalid input. Re-enter number between 0 and 9999.\n”;
cin >> num;
} else {
validInput = true;
}
}
return num;
}
