integer arithmetic

[Altera_Forum]

I'm getting weird results when I do integer division.  

 Frequency is being read in as 60 but the result being stored in var_1b /= 1e9/60 (~1.6E7). Instead the result reported by temp2 is 20522. The division for var_1a is performed correctly.  The offending code:  shared variable frequency: integer range 0 to 25000 :=0; shared variable var_1a, var_1b, var_1c, var_1d: integer; ... frequency := (to_integer(unsigned(Fin))); var_1a := (1E9/pi_2); var_1b := (1E9/(frequency)); temp <= std_logic_vector(to_unsigned(frequency, 16)); temp2 <= std_logic_vector(to_unsigned(var_1b, 16));

[Altera_Forum]

--- Quote Start ---  Instead the result reported by temp2 is 20522  --- Quote End ---  Yes, that's expectable when you cast the divison result to 16 Bit unsigned. :(  At least 24 Bits are needed to hold the result.

[Altera_Forum]

That was the issue. Rookie mistake.

[Altera_Forum]

another apparent rookie mistake - the use of shared variables - why?