Compilare: user.cpp: In function ‘int main()’: user.cpp:30: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:16: warning: unused variable ‘k’ user.cpp:19: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result