Compilare: user.cpp: In function ‘void Add(int, int)’: user.cpp:19:12: warning: statement has no effect [-Wunused-value] for (index; index <= n; index += zeros(index)) ^ user.cpp: In function ‘int Compute(int)’: user.cpp:28:12: warning: statement has no effect [-Wunused-value] for (index; index > 0; index -= zeros(index)) ^ user.cpp: In function ‘void Read()’: user.cpp:70:24: warning: unused variable ‘index’ [-Wunused-variable] int a, b, operation , index; ^~~~~