Help I'm trying to learn sorting array

[Rysha23]

why does it say that array type '[n]' is not assignable and also it says expression did not evaluate to constant all in line 8

#include<iostream>
#include<stdio.h>
using namespace std;

void Bucket_Sort(int array[], int n) 
{
	int i, j;
	int count[n];
	for (i = 0; i < n; i++) 
	{
		count[i] = 0;
	}
	for (i = 0; i < n; i++)
	{
		(count[array[i]])++;
	}
	for (i = 0, j = 0; i < n; i++) 
	{
		for (; count[i]>0; (count[i])--) 
		{
			array[j++] = i;
		}
	}
}
int main() 
{
	int array[100];
	int num;
	int i;
	cout << "Enter How many Numbers : ";
	cin >> num;
	cout << "\n\n";
	cout << "Enter the" << num << "elements to be sorted:\n";
	for (i = 0; i < num; i++) 
	{
		cin >> array[i];
	}
	cout << "\nThe array of elements before sorting : \n";
	for (i = 0; i < num; i++) 
	{
		cout << " " << array[i];
	}
	cout << "\nThe array of elements after sorting : \n";
	Bucket_Sort(array, num);
	for (i = 0; i < num; i++) 
	{
		cout << " " << array[i];
	}
	cout << "\n";
	system("PAUSE");
	return 0;
}

[jlb]

In C++ array sizes must be compile time constants, in your program n is not a compile time constant. I suggest you consider using a std::vector instead.

[Rysha23]

Can you please explain more about it?