Compilare: user.cpp: In function ‘int main()’: user.cpp:11:21: warning: format ‘%d’ expects argument of type ‘int*’, but argument 3 has type ‘short unsigned int*’ [-Wformat=] fscanf(f,"%d",&n); ^ user.cpp:20:23: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 3 has type ‘long long unsigned int’ [-Wformat=] fprintf(f,"%ull",b); ^ user.cpp:11:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^