Compilare: main.c: In function 'parse_int': main.c:27:13: warning: variable 'num' set but not used [-Wunused-but-set-variable] int num; ^~~ main.c:51:21: warning: variable 'num' set but not used [-Wunused-but-set-variable] int num; ^~~ main.c:79:17: warning: variable 'num' set but not used [-Wunused-but-set-variable] int num; ^~~ main.c: In function 'main': main.c:93:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("custi.in", "r", stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:94:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("custi.out", "w", stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~