Although this is implementation-defined in C++, it will most often be 4 bytes (on 32 bit computers).

the sizeof(int) while generally match the bit depth of the internal data bus of the CPU, since this is the most efficient way of transferring a piece of data (generally speaking). it just so happens that the most widely acclaimed processor (x86, starting at 386 and up is 32-bit). however, the Itanium is 64-bit, thus an "int" on an Itanium processor will most likely be 64-bit.

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when Writing code in which the size of an integer is important to maintain through any compilation method, use the __int data types for dos you would want __int16, win 9x __int32 (currently standard), or for the future __int64 they work with the microsoft compilers,and their is an option to change the default of int to any of these, but I can''t remember what it is at this time. if you get an error using the __int16''s it reads it as a short, the __int8''s as char, and __int32''s as a normal int