Compilare: user.cpp: In function ‘int main()’: user.cpp:24: warning: name lookup of ‘k’ changed user.cpp:2: warning: matches this ‘k’ under ISO standard rules user.cpp:13: warning: matches this ‘k’ under old rules user.cpp:8: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:10: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:12: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result