Compilare: user.cpp: In function ‘void Read()’: user.cpp:39:17: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] char sign = NULL; ^ user.cpp:41:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:45:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%c", &sign); ^ user.cpp:48:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &searchedVal); ^