[C/C++] Sortierung von Zahlen

#include "stdafx.h"
#include <stdlib.h>
#include <iostream.h>
#include <windows.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>

int bubblesort(int a[], int arraysize);

int main(int argc, char *argv[])
{
 
int erg,arraysize,a[5],u,l=0;

for(u=1;u<5;u++)
{
 cout<<"Bitte Geben Sie die "<< u <<" Zahl ein:"<<endl;
 cin>>a[l];

 l++;
}

 erg=bubblesort(a,arraysize);

 return 0;
 system("PAUSE");
 
}




int bubblesort(int a[], int arraysize)
{
 int k, l, help,erg;
 do 
 { 
 k = 1;
 for (l=0; l < arraysize-1; l++)
 {
 if (a[l] > a[l+1]) 
 {
 help = a[l];
 a[l] = a[l+1];
 a[l+1] = help; 
 k = 0; 
 }
 }
 }
 while (!k);

 return(erg);
}