Compilare: user.cpp: In function ‘int main()’: user.cpp:38: warning: format ‘%u’ expects type ‘unsigned int’, but argument 4 has type ‘long long int’ user.cpp:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result