Compilare: user.cpp:39:30: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] char line[MAX_LINE] = { NULL }; ^ user.cpp: In function ‘void Read()’: user.cpp:60:51: warning: passing NULL to non-pointer argument 2 of ‘void* memset(void*, int, size_t)’ [-Wconversion-null] memset(line, NULL, sizeof(char) * MAX_LINE); ^ user.cpp:55:31: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(line, MAX_LINE, fin); ^ user.cpp:61:35: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(line, MAX_LINE, fin); ^