Compilare: main.c: In function 'main': main.c:21:18: warning: implicit declaration of function 'getline' [-Wimplicit-function-declaration] 21 | while ((read = getline(&line, &len, f)) != -1) { | ^~~~~~~ main.c:43:5: warning: 'u_cifra' may be used uninitialized in this function [-Wmaybe-uninitialized] 43 | fprintf(o, "%d\n", u_cifra); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~