/**

scope.c - scope and variables explained
   
Copyright (C) 2023-2024 Mert Gör and contributors

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.

Feel free to send an email to mertgor@masscollabs.xyz for your questions

 **/

#include <stdio.h>

int main() {
  int a;
  {
    int b;
    b = 20;
    a = 10;
    printf("a : %d, b : %d\n", a, b); // correct way to get done the job/task
  }
  printf("a : %d\n", a); // correct way to get done the job/task for a variable
  // printf("b : %d\n", b); // error !
  /**
     ~/Projects/hwpplayer1/c-course/c-basic $ gcc scope.c 
scope.c: In function ‘main’:
scope.c:35:22: error: ‘b’ undeclared (first use in this function)
   35 |   printf("b : %d\n", b); // error !
      |                      ^
scope.c:35:22: note: each undeclared identifier is reported only once for each function it appears in
   **/

  return 0;
  
}

/**
   ~/Projects/hwpplayer1/c-course/c-basic $ ./a.out 
a : 10, b : 20
a : 10
 **/