Hey everyone. I'm new to the forums and to C++, and I was working on a program used to call data from a file containing various information about cars when I ran across the error:
undefined reference to (and then it proceeds to list all of my declared functions).
Here's my code:
//Ebony Lewis
//Lab Section L01
//Final Exam Program
#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;
void FindcarVin(int , string , string, int , int );
void ListcarBrand( string ,string ,int );
void ListcarModel(string ,string , int );
void ListcarYear ( int , string , string );
int CarleastMileage( string , string , int , int );
int CarhighestMPG ( string , string , int , float );
//This struct will hold the information for all of the cars.
struct UsedCars
{
int cars;
int vin;
string brand;
string model;
int year;
int mileage;
float MPG;
};
int main ()
{
const int NUM_CARS = 30;
int i= 0, choice;
int inVin;
//Declare a variable called CarChoice of the UsedCars type.
UsedCars CarChoice[NUM_CARS];
ifstream readFile;
readFile.open ( "UsedCars.txt");
if ( !readFile)
cout << " File not open!";
//To make sure that it reads at least once, I'll use do while until the eof is reached.
do
{
readFile >> CarChoice[i] .cars>> CarChoice[i].vin >>CarChoice[i] .brand>>CarChoice[i].model >> CarChoice[i].year;
readFile >> CarChoice[i].mileage >> CarChoice[i].MPG;
i++;
}while(readFile.eof());
//Close the file.
readFile.close ();
//Menu for program.
do{
cout << " Weclome to the Used Car Management Program!"<< endl;
cout << " Please Enter a Choice : ";
cout << " 1. Find Car by Vin # \n ";
cout << " 2. List Cars by Brand \n ";
cout << " 3. List Cars by Model\n " ;
cout << " 4. List Cars by Year \n";
cout << " 5. Find Car with Least Mileage \n";
cout << " 6. Find Car with Highest MPG (Miles Per Gallon) \n";
cout << " 7. Quit \n \n";
cin >> choice;
} while ( choice < 1 || choice > 7);
switch (choice)
{
case 1: cout << "Enter the VIN# : " ;
cin >> inVin;
system("Pause");
for (int i = 0; i < 30; i++)
{
FindcarVin(CarChoice[i].vin, CarChoice[i].brand, CarChoice[i].model, CarChoice[i].year, inVin);
}
break;
case 2: cout << "Now printing all cars by brand..." << endl;
system("Pause");
for (int i = 0; i < 30; i++)
{
ListcarBrand(CarChoice[i].brand, CarChoice[i].model, CarChoice[i].year);
}
break;
case 3: cout << "Now printing all cars by model..." << endl;
system("Pause");
for (int i = 0; i < 30; i++)
{
ListcarModel(CarChoice[i].model, CarChoice[i].brand, CarChoice[i].year);
}
break;
case 4: cout << "Now printing all cars by year..." << endl;
system("Pause");
for (int i = 0; i < 30; i++)
{
ListcarYear(CarChoice[i].year, CarChoice[i].model, CarChoice[i].brand);
}
break;
case 5 : cout << "The following car has the least mileage: \n";
{
system("Pause");
int mile;
mile = CarleastMileage(CarChoice[i].brand, CarChoice[i].model, CarChoice[i].year, CarChoice[i].mileage);
cout << CarChoice[mile].brand << " " << CarChoice[mile].model << " " << CarChoice[mile].year << " " << CarChoice[mile].mileage << endl;
}
break;
case 6: cout << "The following car has the least mileage: \n";
{
system("Pause");
int milespg;
milespg = CarhighestMPG(CarChoice[i].brand, CarChoice[i].model, CarChoice[i].year, CarChoice[i].MPG);
cout << CarChoice[milespg].brand << " " << CarChoice[milespg].model << " " << CarChoice[milespg].year << " " << CarChoice[milespg].MPG << endl;
}
break;
case 7: break;
}
return 0 ;
}
void FindcarVin ( int vinnums[], string brandnames[], string modelnames[], int yearnums[], int specnum )
{
for ( int i = 0; i < 30; i ++ )
{
if (vinnums[i] == specnum)
cout << vinnums[i] << " " << brandnames[i] << " " << modelnames[i] << " " << yearnums [i] << endl;
}
}
void ListcarBrand ( string brandnames [], string modelnames [], int yearnums [])
{
for( int i = 0; i < 30; i++)
{
cout << brandnames[i] << " " << modelnames[i] << " " << yearnums[i] << endl;
}
}
void ListcarModel ( string modelnames [], string brandnames [], int yearnums [])
{
for ( int i = 0; i < 30 ; i ++ )
{
cout << brandnames[i] << " " << modelnames[i] << " " << yearnums[i] << endl;
}
}
void ListcarYear ( int yearnums [], string modelnames [], string brandnames [])
{
for( int i = 0; i < 30; i ++ )
{
cout << brandnames[i] << " " << modelnames[i] << " " << yearnums[i] << endl;
}
}
int CarleastMileage ( string brandnames [], string modelnames [] , int yearnums [], int mileagenums [])
{
int least = mileagenums[0]; //Declare this as the max value.
int mile;
for ( int i = 0; i < 30; i ++ )
{
if (mileagenums[i] < least)
{
least = mileagenums[i];
mile = i;
}
}
return mile;
}
int CarhighestMPG ( string brandnames [], string modelnames [], int yearnums [], float MPGnums [])
{
float highest = MPGnums[0];
int milespg;
for ( int i = 0; i < 30; i ++)
{
if (MPGnums[i] > highest)
{
highest = MPGnums[i];
milespg = i;
}
}
return milespg;
}Can anyone give me a nudge in the right direction?
My code is attached as well.
Thank you!
