Uni Help!

[peachy900757]

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!

#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:-

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

[cilu]

[ redirected ]

[cilu]

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.

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.