Integer division always produces a result which is another integer
value: any fractional part is truncated, i.e. rounded towards zero.
This makes it especially important to provide a decimal point at the
end of a real constant even if the fractional part is zero. For
example:

8 / 3 2
-8 / 3 -2
2**(-3) 1/(2**3) 1/8
0

The combination of the two preceding rules may have unexpected
effects, for example:

(-2)**3 -2 * -2 * -2 -8

whereas (-2)**3.0 is an invalid expression as the computer would
try to evaluate the logarithm of -2.0, which does not exist.
Similarly, the expression: 3 / 4 * 5.0 REAL(3/4) * 5.0
0.0

whereas
5.0 * 3 / 4 15.0 / REAL(4)
3.75