Can anyone tell me whats wrong with my C++ code

#include <iostream>
#include <iomanip>
#include <fstream>
#include <cstdlib>
#include <string>

using namespace std;

int array1 [70];
string array2 [1000];

void numgenerate (void)
{
    int marks,count; 

    for (count=0 ; count<71 ; count++)
    {
        marks = rand() % 101;
        array1 [count] = marks;

        if(marks>=82)
            array2 [count]="A+";
        else if(marks>=74 && marks<81)
            array2 [count]="A";
        else if(marks>=66 && marks<73)
            array2 [count]="B";
        else if(marks>55 && marks<65)
            array2 [count]="B-";
        else if(marks>=68 && marks<55)
            array2 [count]="C";
        else if(marks>=61 && marks<68)
            array2 [count]="C-";
        else if(marks>=54 && marks<61)
            array2 [count]="D";
        else 
            array2 [count]="F";

    }
}

void createfile (void)
{
    numgenerate();

    ofstream file( "G:\\student grade and number file.txt", ios::out );

    if(!file)
    {
        cerr << "File could not be opened" << endl;
        exit( 1 );
    }

    for (int count=0 ; count<=70 ; count++)
    {
        file<<setw(4)<<array1 [count]<<"      "<<array2 [count]<<endl;
    }
}

void main ()
{
    createfile();
    system ("pause");

    return ;
} 

I keep getting the following error

Unhandled exception at 0x61ee797f (msvcp90d.dll) in NEW PROJECT.exe: 0xC0000005: Access violation writing location 0x0000004b.

Can anyone tell me why i keep getting this error and how to correct my code if you can please you will be of great help.

The exit condition of your for loop

for (count=0 ; count<71 ; count++)

should be

for (count=0 ; count<70 ; count++)

In this way, when count == 70, the loop is not executed. If you execute your loop with count == 70, you are out of bounds of your array, whose length is 70 (elements from 0 to 69).

As LumpN pointed out, also the second loop is wrong:

for (int count=0 ; count<=70 ; count++)

Even in this case you are trying to write out of array bounds as the loop is executed also when count == 70