Compilare: user.cpp: In function ‘int main()’: user.cpp:12: warning: format ‘%d’ expects type ‘int*’, but argument 3 has type ‘int’ user.cpp:12: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:16: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:12: warning: ‘n’ is used uninitialized in this function