#include <stdio.h>
using namespace std;

int age = 5;

int main()
{
  cout << age;
  if (age == 5)
  {
    int na = 2;
  }
  cout << na;
}

In function 'int main()':
Line 13: error: 'na' was not declared in this scope
compilation terminated due to -Wfatal-errors.