This is for a signed int, but there is also an unsigned int that holds zero or positive. It has a range of 0 to 4,294,967,295. Just remember - unsigned ints don't need a sign (like + or -1) in front of them because they are always positive or 0.
Short Ints
There is a shorter int type, coincidentally called short int which use 16 bits (2 bytes). This holds numbers in the range -32768 to +32767. If you use a large umber of ints, you can possibly save memory by using short ints. It will not be any quicker, despite being half the size. 32 Bit CPUs fetch values from memory in blocks of 4 bytes at a time. I.e. 32 bits (Hence the name- 32 Bit CPU!). So fetching 16 bits still requires a 32 bit fetch.There is a longer 64 bit called long long in C. Some C++ compilers while not supporting that type directly use an alternate name- e.g. both Borland and Microsoft use _int64. This has a range of -9223372036854775807 to 9223372036854775807 (signed) and 0 to 18446744073709551615 (unsigned).
As with ints there is an unsigned short int type that has a range of 0..65535.
Note: Some computer languages refer to 16 bits as a Word
On the next page : Learn about precision in floats.
