Texas Instruments TI-82 STATS Manual Book page 64

MATH NUM (Number) Operations
iPart(,
fPart(
int(
2.14 Math, Angle, and Test Operations
(integer part) returns the integer part or parts of real or
iPart(
complex numbers, expressions, lists, and matrices.
value
iPart( )
(fractional part) returns the fractional part or parts of real or
fPart(
complex numbers, expressions, lists, and matrices.
value
fPart( )
(greatest integer) returns the largest integer  real or
int(
complex numbers, expressions, lists, and matrices.
value
int( )
Note: For a given value, the result of
iPart(
for nonnegative numbers and negative integers, but one
integer less than the result of
(continued)
int(
is the same as the result of
iPart(
for negative noninteger numbers.