/**
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 .
Feel free to send an email to mertgor@masscollabs.xyz for your questions
**/
#include
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
**/