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#include <iostream>
#include <fstream>
#include <string>
#include "Currency.h"
using namespace std;
/***************************************
Function declarations
***************************************/
//Sort alphabetically array V with n currencies
//currency designation is used for sorting
void sort(Currency V[], int n);
//Read a text file f of currencies and
//Load the currencies into array V
int read_from_file(ifstream& f, Currency V[], int n);
//Display all currencies in V to the screen
void display_DB(Currency V[], int n);
//Read user input and validate
int request(Currency V[], int n, string user_input);
void ask_user(Currency V[], int n);
//Print new table and change currency
void change_currency (Currency V[], int n, int j);
int main()
{
ifstream in_file("currencies.txt"); //file to read
const int SIZE = 100;
Currency DB[SIZE];
string user_input;
//Test if opening the file is succeeded
if ( !in_file.is_open())
{
cout << "Error in file opening" << endl;
return 0; // end the program
}
//Load a file of movies into array DB
int howMany = read_from_file(in_file, DB, SIZE);
if (!howMany)
{
cout << "File is empty!!" << endl;
return 0;
}
//Sort array DB by movies name
sort(DB, howMany);
//Display the sorted movies in array DB to the screen
display_DB(DB, howMany);
//Read and validate user input
ask_user(DB, SIZE);
//Display new table and change currency
change_currency(DB, SIZE, howMany);
//close the files
in_file.close();
return 0;
}
/***************************************
Function definitions
***************************************/
//Sort alphabetically array V with n currencies
//currencies designation is used for sorting
void sort(Currency V[], int n)
{
//Bubble sorting
for ( int pass = 1; pass <= n - 1; pass++ ) // passes
for (int i = 0; i < n - 1; i++ ) // one pass
{
//use operator>
if ( V[ i ] > V[ i + 1 ] )
{
//swap
Currency c = V[ i ];
V[ i ] = V[ i + 1 ];
V[ i + 1 ] = c;
}
}
}
//Read a text file f of currencies and
//Load the currencies into array V
int read_from_file(ifstream& f, Currency V[], int n)
{
Currency c;
int counter = 0;
get(f, c); //read first currency
while ( f ) //test if stream is in good state
{
V[counter] = c; //store currency in V
counter++; //increment the counter
//all n slots of array V are occupied
if (counter == n) break;
get(f, c); //read next currency
}
return counter;
return 0;
}
//Display all currencies in V to the screen
void display_DB(Currency V[], int n)
{
cout << "Currency " << setw(10) << "Value in Euro " << setw(10) << "Name " << endl;
cout << "====================================" << endl;
for(int i = 0; i < n; i++)
{
//Display currencies
put(V[i]);
}
}
int request(Currency V[], int n, string user_input)
{
for (int i = 0; i < n; i++)
{
if (V[i].designation == user_input)
return i;
}
return n;
}
void ask_user(Currency V[], int n)
{
string user_input;
for (int i = 0; i < n; i++)
{
cout << "Enter another currency: ";
cin >> user_input;
if(user_input == "quit")
break;
int v = request(V, n, user_input);
if (v == n)
cout << "Non-existing currency! " << endl;
else change_currency(V, n, v);
}
}
void change_currency(Currency V[], int n, int j)
{
cout << "Currency " << setw(10) << "Value in " << V[j].designation << setw(10) << "Name " << endl;
cout << "==============================================" << endl;
cout << fixed << setprecision(3);
for ( int i = 0; i < n; i++)
{
cout << setw(5) << V[i].designation << setw(10) << V[i].value/V[j].value << right << V[i].name << endl;
}
cout << endl;
}
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