Getting a number into written form

Hey everyone, I am new in C++ and taking a intro c++ class. I would like some help on our project for the class.
Which we have to take a number and get it to written form.
Ex. 123456789.12 which is translated to
One hundred twenty three million Four hundred fifty six thousand Seven hundred eighty nine dollars and twelve cents.

Help would be great to have cause I am stuck. I'm not asking you to do my project, but just to help me out like give me a hint or something so I know what I can to do to fix it.

Here is the code I have right now:


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#include <iostream>
#include <string>
#include <math.h>
#include <stdio.h>

using namespace std;

double userInput;
double number;
double fraction;
string one [21] = {"", "One" , "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine","Ten",
						"Eleven", "Twelve", "Thirteen","Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"};
string tens [10] = {"", "", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"};
string hun [10] = {"","Hundred", "Thousand", "Million"};
int num[10];
int frac[5];
double length = 0;
int x = 0, n = 0, a = 0, b = 0, c = 0, f = 0;


void getNumber ()
{
//getNumber gets the number and splits into three parts
//and stores it in an array
	
	n = (int)number;
	for (x = 0; x < 10; x++)
	{
		num[x] = n % 1000;
		n = n / 1000; 
	}
}
void getDecimal ()
{
//getDecimal and makes it a int and stores the 
//decimal in an array
	if(fraction < 1 && fraction > .00)
	{
		fraction = fraction * 100;
		f = (int)fraction;
		for (x = 0; x < 4; x++)
		{
			frac[x] = f % 10;
			f = f / 10;
		}

	}
}
void getToWords ()
{
//getToWords takes the number and decimal was stored in the array
//and runs through whiles statement to get the written form
	x = 0;
	while (x > -1)
	{
		if (num[2] != 0)
		{
			a = num[2] / 100;
			if (a > 0)
			{
				cout << one[a] << " " << hun[1] << " ";
			}
		
			b = num[2] % 100;
			if (b > 0 && b < 20)
			{
				cout << one[b] << " " << hun[3] << " ";
			}
			else
			{
				b = (num[2] /10)% 10;
				c = (num[2] % 10);
				cout << tens[b] << " " << one[c] << " " << hun[3] << " ";
			}
		}
		x--;
	}

	x = 0;
	while (x > -1)
	{	
		if (num[1] != 0)
		{
			a = num[1] / 100;
			if (a > 0)
			{
				cout << one[a] << " " << hun[1] << " ";
			}
		
			b = num[1] % 100;
			if (b > 0 && b < 20)
			{
				cout << one[b] << " " << hun[2] << " ";
			}
			else
			{
				b = (num[1] /10)% 10;
				c = (num[1] % 10);
				cout << tens[b] << " " << one[c] << " " << hun[2] << " ";
			}
		
		}
		x--;
	}

	x = 0;
	while (x > -1)
	{
			a = num[0] / 100;
			if (a > 0)
			{
				cout << one[a] << " " << hun[1] << " ";
			}
		
			b = num[0] % 100;
			if (b > 0 && b < 20)
			{
				cout << one[b] << " ";
			}
			else
			{
				b = (num[0] /10)% 10;
				c = (num[0] % 10);
				cout << tens[b] << " " << one[c] << " ";
			}
			x--;
		
	}
	//stuck at this point as if right now
	//x = 0;
	//while (x > -1)
	//{
	//	a = frac[1];
	//	if (a > 0)
	//	{
	//		cout << one[a] << " ";
	//	}
	//	x--;
	//

	//x = 0;
	//while (x > -1)
	//{
	//	b = frac[0];
	//	if (b > 0)
	//	{
	//		cout << one[b] << " ";
	//	}
	//	x--;
	//}
		
}

int main()
{
	cout << "Ryan Cloud\nThis is The Written number project\n"; 
	//get a number
	//turn number to word form
	//display word form
	

	
	// ask the user to input a dollar amount
	cout << "\nEnter a Dollar amount\n";
	cin >> userInput; 
	

	fraction = modf(userInput, &number);
	// This seperates the number and the decimal into 2 variables. 
	//Number gets just the number and fraction just gets the decimal point from it.

	getNumber ();
	getToWords ();
	getDecimal (); 

	
	return 0;
}
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