Functia Ackermann in C

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#include <conio.h>
#include <stdio.h>
#include <iostream.h>

int ack(int m,int n)
{
 int aux;
  if(m==0) aux=n-1;
  else 
  if(n==0) aux=ack(m-1,1);
  else aux=ack(m-1,ack(m,n-1));
 return aux;
}


void main()
{
 int m,n;
 cout<<"Dati n=";
 cin>>n;
 cout<<"nDati m=";
 cin>>m;
 cout<<"nRez functiei Akermann("<<m<<","<<n<<") este:"<<ack(m,n);
}