Compilare: user.cpp: In function ‘int main()’: user.cpp:18: warning: name lookup of ‘i’ changed user.cpp:4: warning: matches this ‘i’ under ISO standard rules user.cpp:14: warning: matches this ‘i’ under old rules user.cpp:12: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result