Difference between long and int data types [duplicate]

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From this reference:

An int was originally intended to be
the “natural” word size of the
processor. Many modern processors can
handle different word sizes with equal
ease.

Also, this bit:

On many (but not all) C and C++
implementations, a long is larger than
an int. Today’s most popular desktop
platforms, such as Windows and Linux,
run primarily on 32 bit processors and
most compilers for these platforms use
a 32 bit int which has the same size
and representation as a long.

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