/** * @file foo.c * @author Mert Gör (mertgor@masscollabs.xyz) * @brief Foo example * @version 0.1 * @date 2024-01-24 * * @copyright Copyright (c) 2024 Mert Gör and contributors - GPLv3 or any later * */ #include int foo() { printf("I am foo\n"); } int main() { foo(); } /** In the written book it is foo() and main() and it returns this warning ~/Projects/hwpplayer1/c-course/c-basic $ gcc foo.c foo.c:3:1: warning: return type defaults to ‘int’ [-Wimplicit-int] 3 | foo() | ^~~ foo.c:8:1: warning: return type defaults to ‘int’ [-Wimplicit-int] 8 | main() | ^~~~ **/