Compilare: user.cpp: In function ‘int main()’: user.cpp:19: warning: format ‘%s’ expects type ‘char*’, but argument 3 has type ‘char (*)[20]’ user.cpp:17: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:19: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result