can't print all the permutations of a number

hey,i was just tryin my hand at this program which prints all the possible permutations of a number and m stuck up wid d code.
the code i wrote was:

Code:

---

#include<iostream.h>
#include<conio.h>
int x;
void main()
{
  int arr[20],num;
  cout<<"enter the number of digits:"<<endl;
  cin>>num;
  cout<<"enter the number:"<<endl;
  for(int i=0;i<num;i++)
  {
      cin>>arr[i];
  }
  for(int j=0;j<num;j++)
  {
  for(int k=0;k<num;k++)
  {
    for(int l=0;l<num;l++)
    {
        cout<<endl;
        cout<<arr[l];
    }
    x=arr[num-1];
    for(int m=0;m<num-1;m++)
    {
      arr[m+1]=arr[m];
    }
    arr[j]=x;
  }
  }
  getch();
  }

---

please tel me what changes to make in the code

Try using #include <algorithm>

... perhaps.

Or check out the snippets at the entrance page.