Compilare: user.cpp: In function ‘int main()’: user.cpp:67: warning: comparison between signed and unsigned integer expressions user.cpp:26: warning: unused variable ‘j’ user.cpp:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result