Dim Tmp(4096) as Double
For col=0 to 3
 For q=0 to 4095
  Tm( q)=BigArray(col,q)
 Next q
 QuickSort(Tmp)' I don't know syntax for Quicksort
 For q=0 to 4095
  BigArray(col,q)=Tmp(q)
 next q
Next col

#include <iostream>
#include <cstdlib>
#include <cmath>
using namespace std;

int compare (const void * a, const void * b ) {
    return ( *(int*)a - *(int*)b );
}

const int Rows = 10;
const int Cols = 4;

int main() {
	int array[Cols*Rows];
	int i,j, colToSort;
	srand(time(NULL));
	//Get some random data... Each col should have larger numbers
	for (i=0; i < Cols; ++i) {
 		for (j = 0; j < Rows; ++j) {
			array[Rows*i + j] = rand() % (int)pow((double)10, i+1);
	    }
    }
    //Randomly select a column to sort
    colToSort = rand() % Cols;
    
    //Sort just that collumn...
    qsort(&array[colToSort*Rows], Rows, sizeof(int), compare);
    
    //Display results
	for (i = 0; i < Cols; i ++) {
		//Mark the state of the current column
		cout << ((i == colToSort) ? "Sorted:   " : "Unsorted: ");
	    for(j = 0; j < Rows; ++j) {
		    cout << array[i*Rows + j] << " ";
        }
        cout << endl;
    }
    return 0;
}