3D array problem

I have an assignment to write a program that asks a user the year, model, and condition of a vehicle and display the price. We have to use a 3-D array to hold all of the values and a 2-D array to hold all of the names of the cars. The function I am having a problem with is the one that asks the user the year, model, and condition of the car. Say the person enters "Camry" for the model and "Used" for the condition, I need a way to assign a numeric value to a variable to represent the location of the price in the 3-D array. At first I was going to use a switch statement but visual studio kept telling me that you cant use a switch statement with a string. Here is the code I have so far, I'll post the whole thing but I pointed out where I was having the problem.

Code:

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#include<iostream>
#include<iomanip>
#include<fstream>
#include<string>
#include<cmath>
#include<cctype>
using namespace std;
char userprompt();
void getdata(ifstream& Readfile, float carvalues[100][17][4]);
void openfile(ifstream& Readfile);
float findcarvalue(char carnames[100][100], float carvalues[100][17][4]);
int main()
{
        float carvalues[100][17][4];
        char carnames[100][100]={"Altima", "Avalanche", "Camaro", "Camry", "CTS", "E350", "Escalade", "Explorer", "F150", "Fairlane", "S600", "Silverado", "Suburban", "Tacoma", "Tahoe", "Titan", "Tundra"};
        float carvalue;
        ifstream Readfile;
        openfile(Readfile);
        getdata(Readfile, carvalues);
        switch(userprompt())
        {
                case'f':
                case'F':
                        carvalue = findcarvalue(carnames, carvalues);
                        cout << endl << "The price of that vehicle is " <<carvalue;
                        break;
                case'c':
                case'C':
                        cout << "computeaverage";
                        break;
                case's':
                case'S':
                        cout << "showprices";
                        break;
                case'h':
                case'H':
                        cout << "cheapestcar";
                        break;
                case'a':
                case'A':
                        cout << "showallvalues";
                        break;
                case'q':
                case'Q':
                        break;
                default:
                        cout << "Invalid Input!";
        }
        return 0;
}
void openfile(ifstream& Readfile)
{
        string pathname;
        cout << "Hello, Welcome to Kelly Green Book." << endl;
        cout << "What is the name of the input file? " << endl;
        cin >> pathname;
        Readfile.open(pathname.c_str());
}
char userprompt()
{
        char action;
        cout << endl << "What would you like to do?" << endl
        << "F = Find a car value" << endl
        << "C = Compute average" << endl
        << "S = Show Prices" << endl
        << "H = Find the cheapest car" << endl
        << "A = Show all values" << endl
        << "Q = Quit" << endl;
        cin >> action;
        return action;
}
void getdata(ifstream& Readfile, float carvalues[100][17][4])
{
        float price;
        for (int year = 0; year < 7; year++)
        {
                for (int model = 0; model < 17; model++)
                {
                        for (int condition = 0; condition < 4; condition++)
                        {
                                Readfile >> price;
                                carvalues[year][model][condition] = price;
                        }
                }
        }
}
float findcarvalue(char carnames[100][100], float carvalues[100][17][4])
{
        float year, mlocation, carvalue, clocation;
        char model, condition;
        cout << endl << "Year: ";              //Here is where I am having the problem.
        cin >> year;
        year = 2007 - year;
        cout << endl << "Model: ";
        cin >> model;
        cout << endl << "Condition(Excellent/Fine/Good/Used): ";
        cin >> condition;
        return carvalue;
}

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Any help would be great, Thanks.

You're going to have to figure out what index to use between 0 and 17 or whatever, based on the name of the car, right? If you knew std::map, you wouldn't be asking the question, so I'm guessing you don't. In that case, I guess you can loop over the names in your array o' names -- if the input and carnames[i] compare equal, then that's your index.