Help with error messages

Code:

//main.cpp
#include "aRandomNumber.h"
#include "histogram.h"

int main()
{
	aRandomNumber die1();
	histogram histogram1(die1.getRange());
	for (int i=0; i<10; i++) //calls the add function 9000 times
	{
		histogram1.add(die1.generate());
	}
	histogram1.displayData();
	histogram1.displayHistogram();

	
}

Code:

//histogram.h
#pragma once
class histogram
{
public:
	histogram(void);
	histogram(int numCount);
	~histogram(void);
	void histogram::add(int numGenerated);
	void histogram::displayData();
	void histogram::displayHistogram();
	void histogram::add();

private:
   int * data;
	int low;
	int range;
};

Code:

//histogram.cpp
#include "histogram.h"
#include <iostream>
#include <cstdlib>
using namespace std; 

histogram::histogram(void)
{
	data = new int[9];
	for (int i = 0; i < 9; i++)
	{
		data[i] = 0;
	}
	low = 1;
}
histogram::histogram(int numCount)
{
	range = numCount;
	data = new int[numCount];
}

void histogram::add(int numGenerated)
{
	int data[range];
	int i;
	for(i=0;data[i] != numGenerated; i++)
	{
	}
	if (data[i] = numGenerated)
	{
		data[i]++;
	}
}
void histogram::displayData()
{
	for(int i=0; i<range; i++)
	{
		cout << i + low << " " << data[i] << '\n' ;
	}
}

void histogram::displayHistogram()
{
	// will need to include scaling factor here
	for(int i=0; i<range; i++)
	{
		cout<< i+range;
		
		for(int stars=0; stars<data[i]; stars++)
		{
			cout<<'*';
		}
		cout<< endl;
	}
}
	
histogram::~histogram(void)
{
	delete[] data;
}

Code:

//aRandomNumber.h
#pragma once
class aRandomNumber
{
public:
	aRandomNumber(void); //default constructor
	//~aRandomNumber(void); //default destructor 
	aRandomNumber(int start, int end);
	void aRandomNumber::setRange(int start, int end);
	int aRandomNumber::generate();
	int aRandomNumber::getRange();
private:
	int low;
	int high;

};

Code:

//aRandomNumber.cpp
#include "aRandomNumber.h"
#include <iostream>
#include <cstdlib>
using namespace std;


aRandomNumber::aRandomNumber(void)
{
	low = 1;
	high = 9;
}
aRandomNumber::aRandomNumber(int start, int end)
{
	low = start;
	high = end;
}

int aRandomNumber::getRange()
{
	return (high - low + 1);
}
void aRandomNumber::setRange(int start, int end)
{
	low = start;
	high = end;
}
int aRandomNumber::generate()
{
	int numGenerated; //holds the number generated by the random number function
	numGenerated = low + rand() % getRange(); 
	return numGenerated;
}

I got the following errors from Microsoft Visual Studio 2010 professional:
main.cpp
1>c:\users\ashley\documents\visual studio 2010\projects\random number project\random number project\main.cpp(8): error C2228: left of '.getRange' must have class/struct/union
1>c:\users\ashley\documents\visual studio 2010\projects\random number project\random number project\main.cpp(11): error C2228: left of '.generate' must have class/struct/union
1> histogram.cpp
1>c:\users\ashley\documents\visual studio 2010\projects\random number project\random number project\histogram.cpp(24): error C2057: expected constant expression
1>c:\users\ashley\documents\visual studio 2010\projects\random number project\random number project\histogram.cpp(24): error C2466: cannot allocate an array of constant size 0
1>c:\users\ashley\documents\visual studio 2010\projects\random number project\random number project\histogram.cpp(24): error C2133: 'data' : unknown size
1> Generating Code...

what is wrong with my code

One problem is here:

Code:

aRandomNumber die1();

This looks like a function definition to the compiler, rather than a variable declaration. Remove the empty brackets.

Also, you can't do this in C++ where 'range' is a variable.

Code:

int data[range];

Use a std::vector instead.

This seems to be a follow on from Help with errors on my code!

Better to keep it in one thread if you can