Money break down

Hello, so i'm pretty new at c++ and i need to make a program that breaks down a amount of money entered by bills and cents. I have it almost done completely done, but i'm having trouble knowing if i used functions correctly in the program.


#include <iostream>
#include <iomanip>
using namespace std;
void changeMoney( int);

int main()
{
double dineroTotal;
int dollarAmount;
int centsAmount;
cout << "Favor entrar el valor de los billetes\n";
cin >> dollarAmount;

while (dollarAmount < 0)
{
int temp;
cout << "Usted esta entrando una cantidad negativa favor entre la cantida en dolares positiva";
cin >> temp;
dollarAmount = temp;
}

changeMoney(dollarAmount); // Calling function

return 0;
}


void changeMoney(int dineroTotal)
{
int dollarAmount;
int valorBilletes[6] = { 100,50,20,10,5,1 };
int cantidadBilletes[6] = { 0,0,0,0,0,0 };
int valorCentavos[4] = { 25, 10, 5, 1 };
int cantidadCentavos[4] = { 0,0,0,0 };
int Moneda, SobraM;
int sobra, dinero;
double DineroTotal;

cin >> DineroTotal;

int a = DineroTotal * 100;
dinero = a / 100;
Moneda = a % 100;

for (int x = 0; x < 6; x++)
{
cantidadBilletes[x] = dinero / valorBilletes[x];
sobra = dinero % valorBilletes[x];
dinero = sobra;
cout << "Billetes de " << valorBilletes[x] << "=" <<
cantidadBilletes[x] << "\n";
}

for (int i = 0; i < 4; i++)
{
cantidadCentavos[i] = Moneda / valorCentavos[i];
SobraM = Moneda % valorCentavos[i];
Moneda = SobraM;
cout << "Monedas de " << valorCentavos[i] << "=" <<
cantidadCentavos[i] << "\n";
}


return;
}
Put your code in code brackets [.code][./code] (remove the periods).

There's no "correct" way to use functions I'd assume. As long as the function works, does what you need it to, then it's fine.
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