Compilare: user.cpp: In function ‘int main()’: user.cpp:27: warning: format ‘%i’ expects type ‘int’, but argument 3 has type ‘long long int’ user.cpp:41: warning: format ‘%i’ expects type ‘int’, but argument 3 has type ‘long long int’ user.cpp:57: warning: format ‘%i’ expects type ‘int’, but argument 3 has type ‘long long int’ user.cpp:12: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result