Compilare: user.c: In function ‘bk’: user.c:9:3: warning: implicit declaration of function ‘afis’ [-Wimplicit-function-declaration] if(k==n) afis(); ^ user.c: At top level: user.c:19:6: warning: conflicting types for ‘afis’ [enabled by default] void afis(){ ^ user.c:9:12: note: previous implicit declaration of ‘afis’ was here if(k==n) afis(); ^ user.c: In function ‘main’: user.c:28:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^