Compilare: user.cpp: In function ‘void Add(int, int)’: user.cpp:17:12: warning: statement has no effect [-Wunused-value] for (index; index <= n; index++) ^ user.cpp: In function ‘int BinarySearch(int)’: user.cpp:25:6: warning: unused variable ‘index’ [-Wunused-variable] int index = 0; ^~~~~ user.cpp: In function ‘void Read()’: user.cpp:41:6: warning: unused variable ‘prop’ [-Wunused-variable] int prop; ^~~~ user.cpp:50:24: warning: unused variable ‘index’ [-Wunused-variable] int a, b, operation , index; ^~~~~