Compilare: main.c: In function 'main': main.c:152:17: warning: unused variable 'buf' [-Wunused-variable] char line[32], buf[32]; ^~~ main.c: In function 'rm': main.c:80:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.c: In function 'main': main.c:157:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen( "grader_test20.in", "r", stdin ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:158:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen( "grader_test20.out", "w", stdout ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:159:2: warning: ignoring return value of 'fgets', declared with attribute warn_unused_result [-Wunused-result] fgets(line, 32, stdin); ^~~~~~~~~~~~~~~~~~~~~~ main.c:177:3: warning: ignoring return value of 'fgets', declared with attribute warn_unused_result [-Wunused-result] fgets(line, 32, stdin); ^~~~~~~~~~~~~~~~~~~~~~