Compilare: main.c: In function 'main': main.c:31:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf (file, "%d", &n); ^~~~~~~~~~~~~~~~~~~~~~~ main.c: In function 'readboard': main.c:72:7: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf (file, "%d", &number); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c: In function 'add_to_cache': main.c:165:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.c: In function 'add_to_cache_counter': main.c:191:1: warning: control reaches end of non-void function [-Wreturn-type] } ^