Compilare: user.cpp: In function ‘int main()’: user.cpp:14:29: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[4]’ [-Wformat=] while(fscanf(f, "%s", &s) != EOF) { ^ user.cpp:17:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &x); ^ user.cpp:37:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &x); ^ user.cpp:67:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &x); ^