Mersenne Number Generator
#include <iostream.h>
#include <math.h>
#include <fstream.h>
#include <iomanip.h>
#include <limits.h>
#include <float.h>

	long int max_array_size=7500;      //the maximum size of the array
	int screenwidth =75;    			//standard for most text viewers
//try to keep max_array_size a multiple of screenwidth
	long int n;            		  //the number of the exponent
	int creation[7500];  			  //change this number to allow for longer arrays
	int last_array_number = max_array_size-1;

void getnum()
{
	long int input_getnum = 0;

	cout << "2 to what power?" << endl;
	cin >> input_getnum;
	cout << "Selected Number:" << input_getnum << endl;
	n = input_getnum;
}

void mersenne_creation()
{

	cout << "Creating Mersenne Number: " << n << endl;


	creation[last_array_number]=1;
	cout << "output:" <<creation[last_array_number] << endl;
	int x;
	int y;
	int z;
	int high;
	int high2;
	for(x = n; x>= 1; x--)
	{
		//cout << "Counting down x:" << x << endl;
		for(y = 0; y<=last_array_number; y++)
		{
			creation[y]= 2*creation[y];
			//cout << creation[y] << endl;
		}
		for(z=last_array_number; z >= 0; z--)
		{
			if (creation[z] > 9)
				{
				high = floor(creation[z]/10);
				high2 = creation[z]-(10*high);
				creation[z]=high2;
				creation[(z-1)]=creation[(z-1)]+high;
				}
			//cout << creation[y] << endl;
		}

	}
	creation[last_array_number]= creation[last_array_number]-1;
}

print_out()
{
	ofstream outf("prime.txt");

	int y;
	int length = screenwidth -1;

	outf << "The number inputed is:      " << n << endl;
	outf << "The length of the array is: "<< max_array_size << endl;
	outf << "The Mersenne Number is:" << endl;

	for(y = 0; y<=last_array_number; y++)
	{
		cout << creation[y];
		outf << creation[y];

		if(y == length)
		{
		length=length+screenwidth;
		cout << endl;
		outf << creation[y] << endl;
		}
	}
	outf.close();
}
void main(void)
{
	getnum();

	mersenne_creation();

	print_out();
	//cout << "Last Digit:" << creation[max_array_size-5] << creation[max_array_size-4] << creation[max_array_size-3] << creation[max_array_size-2] << creation[max_array_size-1] ;
}