Compilare: user.c: In function ‘main’: user.c:32:25: warning: comparison between pointer and integer [enabled by default] while (buffer[++last] != NULL); ^ user.c:36:21: warning: comparison between pointer and integer [enabled by default] while (buffer[j] != NULL) ^ user.c:37:47: warning: operation on ‘j’ may be undefined [-Wsequence-point] nr += (buffer[j] - '0') * twoPows[last - j++]; ^ user.c:39:4: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long long int’ [-Wformat=] fprintf(out, "%d", nr); ^ user.c:22:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &nrTests); ^ user.c:28:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%s", buffer); ^