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.