Compilare: user.cpp: In function ‘int main()’: user.cpp:43: warning: format ‘%lu’ expects type ‘long unsigned int’, but argument 3 has type ‘unsigned int’ user.cpp:51: warning: format ‘%u’ expects type ‘unsigned int’, but argument 3 has type ‘long unsigned int’ user.cpp:8: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result