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 (http://www.codeguru.com/forum/showthread.php?t=323835).