C++ :: Using A String / Enum To Access Int Matrix?

Any way to use a string to access a specific item in a matrix of int[X].

I have a program which uses enums as iterators to reference a large amount of data. To select an item in the matrix, the user will enter a string, which is also an enum, which also must serve as an iterator for something in the matrix. Here is a toybox example:

#include <iostream>
#include <string>
using namespace std;
enum NyNumbers { First, Second, Third, Forth, LAST_VALUE };
int main(int argc, char* argv[]) {
int Matrix[LAST_VALUE] = { 1, 3, 7, 12 };

[Code] .....

The idea is the user executes the program by typing "./RUN First" to print out the first element in the MyNumbers array, "./RUN Second" to access the second, and so on. I can't use static numbers for the iterator. (i.e., "./RUN 1") I must reference by enum/string.

When run, the output of this problem is thus:

====================================================================
user@debian$ ./RUN Second
Matrix[ atoi(Second) ]: 1
user@debian$
====================================================================

BTW, if I change line 12 to this

====================================================================
cout<<Matrix[ argv[1] ]<<"
";
====================================================================

The error message is this

====================================================================
user@debian$ make
g++ -g -Wall -ansi -pg -D_DEBUG_ Main.cpp -o exe
Main.cpp: In function `int main(int, char**)':
Main.cpp:12: error: invalid types `int[4][char*]' for array subscript
make: *** [exe] Error 1
user@debian$
====================================================================

Which isn't unexpected. How to input the enum as argv[1]?