#include <iostream>
 
int f(const int i)
{
  return i;
}
 
int main()
{
  /* When constants allocate memory? */
  const int c1 = 1;    // no memory needed
  const int c2 = 2;    // need memory   
  const int c3 = f(3); // need memory
  const int *p = &c2;
 
  int t1[c1];
  int t2[c2];
  // prog.cpp:18:12: warning: ISO C++ forbids variable length array 't3'
  int t3[c3];
 
  int i; std::cin >> i;
  switch(i)
  {
    case c1: std::cout << "c1"; break;
    case c2: std::cout << "c2"; break;
    // prog.cpp:25:10: error: 'c3' cannot appear in a constant-expression
    case c3: std::cout << "c3"; break;
  }
  return 0;
}

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