Hey Jinyoung If I remember correctly floats are 4 bytes and doubles are 8 bytes (hence the name double) but Chris may need to clarify. An integer value must be at *least* 2 bytes (or 16 bits) but it is *usually* 4 bytes (32 bits). It's a bit confusing because different systems will use a different number of bytes to represent an int, however a 32/64 bit system should use 32 bits. So, it should be safe to assume it is just 4 bytes (32 bits). However, there are types you can use that guarantee the number of bytes used (these are called **Fixed width Integer types**). Not sure if you guys will need them in this unit. The *more bytes* (or bits) used the *larger the number* that can be represented. I hope that helps.

Thank you very much :)