Qv does not differentiate between integers and real numbers, but if you want to display them like 1, 2, 3... then just use Num(field), or Num(field, '0').
As far as functions go
floor(field) - will discard the fractional part
ceil(field) - will discard the fractional part and round up to the next integer
round(field) - will round the value to the nearest integer. (check the manual for other round options)
Hope that helps