Compilare: user.cpp: In function ‘void read()’: user.cpp:27:29: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[21]’ [-Wformat=] fscanf(in, "%s", &number); ^ user.cpp:26:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &demand); ^ user.cpp:27:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%s", &number); ^