Compilare: user.cpp: In function ‘int main()’: user.cpp:12:21: warning: format ‘%d’ expects argument of type ‘int*’, but argument 3 has type ‘long int*’ [-Wformat=] fscanf(in, "%d", &n); ^ user.cpp:28:40: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 3 has type ‘long int’ [-Wformat=] fprintf(out, "%ul", res); ^ user.cpp:13:6: warning: unused variable ‘b’ [-Wunused-variable] int b=0; ^ user.cpp:14:6: warning: unused variable ‘cn’ [-Wunused-variable] int cn=n; ^ user.cpp:12:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^