54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
/**
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scope.c - scope and variables explained
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Copyright (C) 2023-2024 Mert Gör and contributors
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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Feel free to send an email to mertgor@masscollabs.xyz for your questions
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**/
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#include <stdio.h>
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int main() {
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int a;
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{
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int b;
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b = 20;
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a = 10;
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printf("a : %d, b : %d\n", a, b); // correct way to get done the job/task
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}
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printf("a : %d\n", a); // correct way to get done the job/task for a variable
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// printf("b : %d\n", b); // error !
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/**
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~/Projects/hwpplayer1/c-course/c-basic $ gcc scope.c
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scope.c: In function ‘main’:
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scope.c:35:22: error: ‘b’ undeclared (first use in this function)
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35 | printf("b : %d\n", b); // error !
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| ^
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scope.c:35:22: note: each undeclared identifier is reported only once for each function it appears in
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**/
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return 0;
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}
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/**
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~/Projects/hwpplayer1/c-course/c-basic $ ./a.out
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a : 10, b : 20
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a : 10
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**/
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