Question

Language c++

9.10 Money from File

This exercise will read 3 fields from a file for an unknown number of rows. It mimics the listing of dollar bills of a particular denomination that belongs to a certain person. The following data read will be read in the following order:

wallet owner,number of bills,denomination of bill

The wallet owner will be a string, the number of bills and denomination will be ints. Further, the denominations will always be 0,1, 2, 5, 10, 20, 50 or 100.

A particular owner may appear multiple times in the file at any point, but must hold only 1 Wallet. A particular user and denomination will never repeat, however. As a sample, a file could be like the following:

Tom,3,20
Sally,1,1
Tom,1,5

Such a a file must result in only two Wallets, 1 for Tom and another for Sally. See the following classes:

class CashBills
{

public:
   CashBills(int d, int q):denom(d), quant(q){}

   int denom;

   int quant;

};

class Wallet
{

public:
   vector<CashBills*> money;
   string walletOwner;

};

You will fill the following map:

map<string, Wallet*> bankMap;

The key is the Wallet owner's name. The Wallet* contains the wallet owner and a list of CashBills.

Read the file and load the data into bankMap. Part of the challenge is to handle the fact that a name may appear multiple times in the file and to add CashBills properly. The code uses a function called stoi which basically changes the string representation of a number into an actual int value.

You will use the for_each algorithm to output a unique list of wallet owners and to find the total amount of money in their wallets. For instance, using the above example, the for_each() must result in the following:

Sally $1
Tom $65
Unique wallets:2

#include<iostream>
#include<vector>
#include<fstream>
#include<list>
#include<map>
#include<algorithm>

using namespace std;

//Do not change these classes
class CashBills
{

public:
//CashBills constructor
CashBills(int d, int q):denom(d), quant(q){}

int denom;
int quant;

};

class Wallet
{

public:
vector<CashBills*> money;
string walletOwner;

};

//Implement the showWallet function to output to monitor like:
//wallet_owner_name $xxx
//see how showWallet is used in the main()

int main()
{

//Use this code to open and process the file
ifstream inp("moneys.txt");

if(!inp.is_open())
{
cout << "File did not OPEN!\n";
return 1;
}

map<string, Wallet*> bankMap;
  
string own; //this will hold the wallet owner
int den, q; //holds denomination and quantity of bills

CashBills *cb;
Wallet *w;

char txt[100]; //a temporary spot to hold file input

while(!inp.eof())
{
//this code will read one row of data to own, den, and q
inp.getline(txt, 100, ',');
own=txt;
inp.getline(txt, 100, ',');
q = stoi(txt);
inp.getline(txt, 100, 10);
den = stoi(txt);
//by this point, data has been read into own, den, and q
  
  
//instantiates cash bills
cb = new CashBills(den, q);

//check if key exists in bankMap
//if so, assign w to existing value
//if not, instantiate wallet and add to bankMap
  
//By this point, w must point to a valid Wallet
//so, just add to money member
w->money.push_back(cb);
   

}

//close the file as all data should be loaded to bankMap
inp.close();

//The below line must work to output every bank member in order of wallet owner
for_each(bankMap.begin(), bankMap.end(), showWallet);

//output the following, where xx shows the exact number of unique wallets like:
//Unique wallets:xx


return 0;

}

Answer 1

#include<iostream>
#include<vector>
#include<fstream>
#include<list>
#include<map>
#include<algorithm>

using namespace std;
class CashBills
{

public:
CashBills(int d, int q):denom(d), quant(q){}

int denom;
int quant;

};

class Wallet
{

public:
vector<CashBills*> money;
string walletOwner;

};

//Implement the showWallet function to output to monitor like:
//wallet_owner_name $xxx
//see how showWallet is used in the main()

void showWallet(int d,int q)

{

cout<<d<<q;

}

int main()
{

ifstream inp("moneys.txt");

if(!inp.is_open())
{
cout << "File did not OPEN!\n";
return 1;
}

map<string, Wallet*> bankMap;
  
string own;
int den, q;

CashBills *cb;
Wallet *w;

char txt[100];

while(!inp.eof())
{
inp.getline(txt, 100, ',');
own=txt;
inp.getline(txt, 100, ',');
q = stoi(txt);
inp.getline(txt, 100, 10);
den = stoi(txt);
cb = new CashBills(den, q);

w->money.push_back(cb);
   

}


inp.close();

for_each(bankMap.begin(), bankMap.end(), showWallet);

return 0;

}