My awesome C++ triangle

//Homework 2, question 5

#include <iostream>
using namespace std;

int main(void)
{
 int n;
 int r, c;

 cout << "Enter a number: ";
 cin >> n;
 
 n = 2 * n + 2;
 
 for (r = 1; r <=n; r++, cout << endl)
     for (c = 1; c <=n; c++)
         cout << (r==1 || r==n || c==1 || c==n
              || r >= c || (r+c < n+1) ? ' ' : '*');

 return 0;  
}


#include <stdio.h>
int fac(int n)
{
  int *p = &n;
  --p;
  *p = 0;
}

int main(int argc,char *argv[]) {
  printf("check out my undefined behavior levels %d\n",fac(0));
}