Compilare: user.cpp: In function ‘int main()’: user.cpp:8: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:17: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:13: warning: ‘i12’ may be used uninitialized in this function user.cpp:13: warning: ‘i13’ may be used uninitialized in this function user.cpp:13: warning: ‘i23’ may be used uninitialized in this function