Question

c++

Write a program that opens a file, reads records into a container of data structures, and prints out the sum in order.
You can use Vectors to contain the data structures.

1. Create a data structure to represent the record ==> struct Cost in cost.h
2. Write a function called ==> parse_account, that parses one (string) record from a file, and
populates a data structure with that data.
3. Write a function called sum_accounts, that when passed a container of structures, returns
a double representing the sum of the amounts in those structures.
4. Create a main program
     a) Create an appropriate container of data structures
     b) Open the accounts file (costfile.txt)
     c) While you can read a line from the file without error
          Call parse_account, which returns a data structure.
          Add the returned data structure to the container (using, pushToV)
    d) Call sum_accounts to determine the amount of money represented
    e) Print a message and the result.

Try this with some sample data, such as the following lines in costfile.dat
You may add or create your own data file to test the program with:
You can start with the data in a text file and then write the data in a binary file, this
way you practice with both file types.

Description      Amount    Item number
Pass_Go           200.00          135
Reading_RR       50.00          136
Connecticut      120.00          137
Chance              25.00          138

- Use input file to read the above Data
- Use header file for the data structure definition
- Use Multiple Source Files for function definitions and Application, each in separate file (.cpp file)

Answer 1

Here is the program

#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <sstream>
#include "cost.h"
using namespace std;

// function declarations
struct cost parse_account(ifstream*);
void pushToV(vector<cost>&,struct cost);
double sum_accounts(vector<cost>& );

// pushes the data record into cotnainer
void pushToV(vector<cost> &records,struct cost onerecord)
{
//add the record to the container
records.push_back(onerecord);
}

// Find sum of the account
double sum_accounts(vector<cost> &records)
{
double sum=0;
// loop through the vector
for(int i=0;i<records.size();i++)
{
sum=sum+(records[i].amount);
}
return sum;
}

// the driver program
int main()
{
vector <cost> records;
//ifstream object to read a text file
ifstream ifs;
struct cost record;
// open the cost file
ifs.open("costfile.txt");
if(!ifs.is_open())
{
cout<<"Unable to open file"<<endl;
return 0;
}
cout<<"----- The account Data -----"<<endl;
//loop through the file content
while(!ifs.eof())
{
//call parse_account and store returned
record=parse_account(&ifs);
//push the record into the container
pushToV(records,record);
}
//print the message and the sum
cout<<"---------------------------------"<<endl;
cout<<"The sum = $ "<<sum_accounts(records)<<endl;
//system("pause");
return 0;
}
// parses one record each time and populates the struct record
struct cost parse_account(ifstream *ifs)
{
struct cost record;
stringstream stringRecord;
string str;
//read a record into string str
getline(*ifs,str);
//print the record
cout<<str<<endl;
//pass the string str into stringRecord
stringRecord<<str;
// fill the record structure
stringRecord>>record.description;
stringRecord>>record.amount;
stringRecord>>record.itemNum;
return record;
}

The cost.h file code
#include <iostream>
using namespace std;
struct cost
{
string description;
double amount;
int itemNum;
};

content of costfile.txt
Description Amount Item number
Pass_Go 200.00 135
Reading_RR 50.00 136
Connecticut 120.00 137
Chance 25.00 138

Here is the image of program output