Compilare: main.c:11:6: warning: return type of 'main' is not 'int' [-Wmain] void main(){ ^~~~ main.c: In function 'main': main.c:17:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(ptr, "%d", &numbers); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:20:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(ptr, "%d %d", &a, &b); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~