Uni Help!

i am doing very basic c++ at uni but i am finding it quite difficult!

i have an assessment but i am slightly stuck on a part of it!

what i need to do is create a basic sales program. what it needs to do is read a file, write to a file, find highest and lowest data! i have managed to get to the reading of the file but finding the highest and lowest sales figure i am struggling on!

this is the code i have so far!

Code:

---

#include <iostream>
#include <fstream>

using namespace std;

int sales_data();
int save_data();

int main()
{
    int num;
   
    cout << "MAIN MENU" << endl;
    cout << "\nEnter a number between 1 and 3" << endl;
    cout << "\n-----------------------------" << endl;
    cout << "1. View Sales Details" << endl;
    cout << "2. Export and Save Sales Details" << endl;
    cout << "3. Exit" << endl;
    cout << "-----------------------------" << endl;
    cin >> num;


  switch(num)
  {
      case 1:
      system("CLS");
      sales_data();
      break;
      case 2:
      system("CLS");
      save_data();
      break;
      case 3:
      system("exit");
      break;
      default:
      cout << "Incorrect Number" << endl;
      break;
  }
}

int sales_data()
{

  int num;
 
  int depid;
  double sales;
 
  ifstream salesfile ("ica_sales.txt");
        if (salesfile.is_open())
        {         
        cout << "SALES DATA\n" << endl;         
        while (! salesfile.eof() )
        {     
        salesfile >> depid >> sales;
        cout << depid << "\t" << sales << endl;
        }
        salesfile.close();
        }
        else cout << "Unable to open file" << endl; 
 
  cout << "\nSALES MENU" << endl;
  cout << "\nEnter a number between 1 and 4" << endl;
  cout << "\n-----------------------------" << endl;
  cout << "1. View Highest Department" << endl;
  cout << "2. View Lowest Department" << endl;
  cout << "3. Back to main" << endl;
  cout << "4. Exit" << endl;
  cout << "-----------------------------" << endl;
  cin >> num;

  switch(num)
  {
      case 1:
     
      break;
      case 2:
      break;
      case 3:
      system("CLS");
      main();
      break;
      case 4:
      system("exit");
      break;
      default:
      cout << "Incorrect Number" << endl;
      break;
  }
  return 0;
}

int save_data()
{
    int num;
   
  cout << "Enter a number between 1 and 4" << endl;
  cout << "-----------------------------" << endl;
  cout << "1. Dont no what i need in here yet!!!" << endl;
  cout << "2. Back to Main" << endl;
  cout << "3. Exit" << endl;
  cout << "-----------------------------" << endl;
  cin >> num;

  switch(num)
  {
      case 1:
      break;
      case 2:
      system("CLS");
      main();
      break; 
      case 3:
      system("exit");
      break;
      default:
      cout << "Incorrect Number" << endl;
      break;
  }
  return 0;
}

---

---------------------------

this is what the text file looks like:-

Code:

---

01        633.79
02        2242.03
06        4587.12
08        2318.98
05        565.32
07        865.99
03        6591.96
04        1974.90
09        453.33

---

what i need to do is display the highest and the lowest figures (which are going to change regulary)!

Cheers peachy

srry if its a bit confusing

[ redirected ]

What you have to do is reading the values in a vector or something, and then sort the vector according to some logic, like the greater sale.

Code:

---

struct Data
{
  int depid;
  double sales;

  Data():depid(0), sales(0) {}
};

bool is_lower(const Data& d1, const Data& d2)
{
  return d1.sales < d2.sales;
}

std::vector<Data> listData;

// ...
while (! salesfile.eof() )
{
  Data data;
  salesfile >> data.depid >> data.sales;

  listData.push_back(data);
}

// ...

// and now sort the vector
std::sort(listData.begin(), listData.end(), is_lower);

---

For comparing floating point values, see this FAQ.