Vending Machine Advice

[iBLooDiESiN]

Basically there are no errors, I would just like to get advice and ask, is this a good proper type of coding for a beginner? Are there any bad habits that I am doing in here?

#include <iostream>
#include <string>

using namespace std;

signed holdUP()
{ cin.sync(); cin.ignore(numeric_limits<streamsize>::max(),'\n'); return 0; }

class user
{
public:
	int moneyHolder;
};

string Line(80,'_'), cutLines(80,'-');

void mainHeader(void)
{ cout<<("Vending Machine Version: 1.001")<<endl<<Line<<endl; }

int main(void)
{
	user buyer; 
	buyer.moneyHolder = /*$*/(float)30.00;

	char menu; float water = /*$*/1.50; float soda = /*$*/2.50; float milkyway = /*$*/3.50;
	unsigned choice;

	system("Color 0a"); //Black Background, Light Green Letters.

	mainHeader();

	string userName;
	cout<<"Before we begin, you must enter your name."<<"\n\n\t(Hit Enter Twice When Done Writing Name)"<<endl
		<<"\nEnter name:> " ;cin>>userName;
	holdUP(); system("Cls");

	mainHeader();
	cout<<"Type in \"M\" for male or \"F\" for female\n";
	char gender;
	cout<<"Enter Gender:> "; cin>>gender;
	holdUP(); system("Cls");

	if (gender == 'M' || gender == 'm')
	{ mainHeader();
	cout<<"\t\t\t\t\t\t(You have [$"<<buyer.moneyHolder<<"] in your wallet)"<<endl;
	cout<<"\nPress \"m\" for menu pop-up options:> "; cin>>menu;

	if (menu == 'M' || menu == 'm') //Display Menu Options.
	{ cout<<"\n\t\t\t\t::MENU::"<<endl
			<<"\t\t\t\t1 = Water $"<<water<<"0"<<endl
			<<"\t\t\t\t2 = Soda $"<<soda<<"0"<<endl
			<<"\t\t\t\t3 = Milkyway $"<<milkyway<<"0"<<endl
			<<cutLines; }

	do
	{ cout<<"\nEnter Choice:> "; cin>>choice;

	if (choice == 1)
		{ cout<<"\n\t\tYou received {Water} Enjoy!"<<endl
				<<"\n\t"<<userName<<" contains [$"<<buyer.moneyHolder - 1.50<<"0] in wallet"<<endl;
			buyer.moneyHolder -= 1.50; }

	if (choice == 2)
	{ cout<<"\n\t\tYou received {Soda} Enjoy!"<<endl
			<<"\n\t"<<userName<<" contains [$"<<buyer.moneyHolder - 2.50<<"0] in wallet"<<endl;
		buyer.moneyHolder -= 2.50; }

	if (choice == 3)
	{ cout<<"\n\t\tYou received {Milkyway} Enjoy!"<<endl
			<<"\n\t"<<userName<<" contains [$"<<buyer.moneyHolder - 3.50<<"0] in wallet"<<endl;
		buyer.moneyHolder -= 3.50; } } while (buyer.moneyHolder != 0); }

	if (gender == 'F' || gender == 'f')
	{ mainHeader();
	cout<<"\t\t\t\t\t\t(You have [$"<<buyer.moneyHolder<<"] in your purse)"<<endl;
	cout<<"\nPress \"m\" for menu pop-up options:> "; cin>>menu;

	if (menu == 'M' || menu == 'm') //Display Menu Options.
	{ cout<<"\n\t\t\t\t::MENU::"<<endl
			<<"\t\t\t\t1 = Water $"<<water<<"0"<<endl
			<<"\t\t\t\t2 = Soda $"<<soda<<"0"<<endl
			<<"\t\t\t\t3 = Milkyway $"<<milkyway<<"0"<<endl
			<<cutLines; }

	do
	{ cout<<"\nEnter Choice:> "; cin>>choice;

	if (choice == 1)
		{ cout<<"\n\t\tYou received {Water} Enjoy!"<<endl
				<<"\n\t"<<userName<<" contains [$"<<buyer.moneyHolder - 1.50<<"0] in purse"<<endl;
			buyer.moneyHolder -= 1.50; }

	if (choice == 2)
	{ cout<<"\n\t\tYou received {Soda} Enjoy!"<<endl
			<<"\n\t"<<userName<<" contains [$"<<buyer.moneyHolder - 2.50<<"0] in purse"<<endl;
		buyer.moneyHolder -= 2.50; }

	if (choice == 3)
	{ cout<<"\n\t\tYou received {Milkyway} Enjoy!"<<endl
			<<"\n\t"<<userName<<" contains [$"<<buyer.moneyHolder - 3.50<<"0] in purse"<<endl;
	buyer.moneyHolder -= 3.50; } } while (buyer.moneyHolder != 0); }

	holdUP(); return EXIT_SUCCESS;
}