Compilare: user.cpp: In function ‘int main()’: user.cpp:22:35: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 3 has type ‘long long unsigned int’ [-Wformat=] fprintf(out, "%u\n", rez+1); ^ user.cpp:14:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d\n", &n); ^ user.cpp:17:31: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, sizeof(s),in); ^