if two integers perform division,the result is the quotient. the fractional part is truncated
for example 5/4 is 1 and 10/4 is 2 .
to get an accurate result with fraction part, one of the values involved in the division must be a number
with a decimal poin.
fox example, 5.0/4 is 1.25 and 10/4.0 is2.5