#include <iostream.h>
#include <stdlib.h>
#include <signal.h>

void signal_handler(int signalValue)
{
  cout << endl << "Interrupt signal (" << signalValue
       << ") received." << endl;
  exit(1);
}

long triangle(long n);

int main()
{
  //signal(EXCEPTION_STACK_OVERFLOW, signal_handler);
  for (unsigned long j = 0; j != 40; j++) signal(j, signal_handler);
  //signal(SIGSEGV, signal_handler);
  //signal(SIGABRT, signal_handler);
  //signal(SIGILL, signal_handler);
  //signal(SIGTERM, signal_handler);
  for (unsigned long i = 0; i != 60; i++) {
    cout << "triangle(" << i << ") = " << triangle(i) << endl;
  }
  //raise(SIGILL);
  cout << "triangle(10000000) = " << triangle(10000000) << endl;
  return 0;
}


long triangle(long n)
{
  return n <= 0ul ? 0ul : n + triangle(n - 1);
}