c++ out-of-Auswahl bei Speicher Fehler

Hier ist der code, den ich für eine Programmierung Zuordnung, die ich habe. Im immer diese Fehlermeldung wenn ich das Programm starte
"Unbehandelte Ausnahme bei 0x772BC41F in STRUCT2.EXE: Microsoft C++ - Ausnahme: std::out_of_range an Speicherposition 0x0043ED04." Wenn verstehe ich das richtig, der Fehler bedeutet, dass mein array überschritten hat, werden die zugeteilten Speicherplatz. ist das richtig? und wenn dies richtig ist, was mache ich falsch? Meine input-Datei hat weniger als 30 Elementen in es.

#include "stdafx.h"
#include <iostream>
#include <iomanip>
#include <fstream>
#include <string>
#include <cmath>
#include <sstream>
#include <cctype>
 using namespace std;

struct Element
{
string Name;
char eN1;
char eN2;
float Weight;
};

struct Formula
{
char Element1;
char ElementA;
int Atom;
 };

void ELEMENTS(Element ElmAry[30]);
float Str2Float(string Weight);
void FORMULAS(Formula FormAry[30]);
float CalculateMoleculeWeight(Element ElmAry[30], Formula FormAry[30]);

int main()
{
ifstream inputFile1;
ifstream inputFile2;
ofstream outputFile;

inputFile1.open("Element.txt");
inputFile2.open("Formula.txt");
outputFile.open("Molecular Weight.txt");

Element ElmAry[30];
Formula FormAry[30];
char inputCh;
int i = 0;
string String1;
string mFor;
string ABRV;
int ElmDigit = 0;
float StringWeight = 0;
string Name;
string Weight;
int LENGTH = 0;
float MOLEWT;


if(!inputFile1)
{
    cout << "Couldn't find the Element.txt file." << endl;
    return 0;
}

if(!inputFile2)
{
    cout << "Couldn't find the Formula.txt file." << endl;
    return 0;
}

ELEMENTS(ElmAry);

while(inputFile1)
{
    Name = String1.substr(0,2);
    ElmAry[i].Name = Name;

    Weight = String1.substr(3,10);
    String1.clear();
    StringWeight = Str2Float(Weight);
    ElmAry[i].Weight = StringWeight;
    i++;
}
i--;

FORMULAS(FormAry);

while (inputFile2)
{
    getline(inputFile2,String1);
    LENGTH = String1.length();
    int j = 0;
    int n = 0;
    while( j < LENGTH)
    {
        int pos = 0;
        pos = String1.find(')');
        while(n < LENGTH)
        {
            inputCh = String1.at(n);
            if(isalpha(inputCh) && isupper(inputCh))
            {
                FormAry[j].Element1 = String1.at(n);
                n++;
                inputCh = String1.at(n);
            }

            if(isalpha(inputCh) && islower(inputCh))
            {
                FormAry[j].ElementA = String1.at(n);
                n++;
                inputCh = String1.at(n);
            }

            if(ispunct(inputCh))
            {
                n++;
                inputCh = String1.at(n);
                ElmDigit = (inputCh-'0');
            }

            if(isdigit(inputCh))
            {
                FormAry[j].Atom = ElmDigit;
                n++;
            }
            inputCh = String1.at(n);

            j++;

            if(iscntrl(inputCh))
            {
                n++;
                inputCh = String1.at(n);
                j++;
            }
            n++;
        }
    }
}

MOLEWT = CalculateMoleculeWeight(ElmAry, FormAry);

cout << "\t\t MOLECULAR WEIGHT CHART \t\t\n" << endl;
cout << "\n| FORMULA |\t " << "\t| ATOM.WT |" << endl;
cout << "_______________________________";
outputFile << "\t\t MOLECULAR WEIGHT CHART \t\t\n" << endl;
outputFile << "\n| FORMULA |\t " << "\t| ATOM.WT |" << endl;
outputFile << "_______________________________";

for (int a = 0; a < 30; a++)
{
    cout << MOLEWT << endl;
    outputFile << MOLEWT << endl;
}

inputFile1.close();
inputFile2.close();
outputFile.close();
cin.get();
cin.get();
return 0;
}

void ELEMENTS(Element ElmAry[30])
{
for(int i = 0; i < 30; i++)
{
    ElmAry[i].Weight = 0;
}
}

void FORMULAS(Formula FormAry[30])

{
for(int x = 0; x < 30; x++)
{
    for(int x = 0; x < 9; x++)
    {
        FormAry[x].Atom = 1;
    }
}

}

float Str2Float (string x)
{
    stringstream ss(x);
    float StringWeight;
    ss >> StringWeight;
    return StringWeight;
}

float CalculateMoleculeWeight(Element ElmAry[30], Formula FormAry[30])
{
int i;
int j=0;
float MoleWT = 0;
float MoleSum = 0;
char e1;
char e2;
char f1;
char f2;

    for(i = 0; i < 30; i++)
    {
        f1 = FormAry[j].Element1;
        f2 = FormAry[j].ElementA;
        e1 = ElmAry[i].eN1;
        e2 = ElmAry[i].eN1;
        if
            (e1 == f1 && e2 == f2)
    {
        MoleWT = ElmAry[i].Weight * FormAry[j].Atom;
        MoleSum = MoleSum + MoleWT;
        j++;
    }
}
return MoleSum;
}

wenn ich

 while(inputFile1)
 {
    Name = String1.substr(0,2);
    ElmAry[i].Name = Name;

    Weight = String1.substr(3,10);//invalid string position
    String1.clear();
    StringWeight = Str2Float(Weight);
    ElmAry[i].Weight = StringWeight;
    i++;
}
i--;

Gewicht = String1.substr(3,10); gibt mir eine ungültige Zeichenfolge position