Double and Int

[ASIC_LabRat]

Is there a proper way to do a math operation on 2 int declared intergers that is known should return a double or a floating point variable? I have an operation on 2 ints

int Adaptive_Gain_value

int Adj_Gain_value

double results

// to get or perscribe a percentage of the Adaptive_Gain_value... lets to the get the Percentage first.

 results = Adj_Gain_value / Adaptive_Gain_value;

// this always returns a 0.000000000

// int the past, I thought this should work without having to change the declaration, or do I need to do some special cast?

Thanks!

ChipB

Message Edited by ASIC IIBU Tech on 05-07-2008 04:31 PM

[gtoph · Accepted solution]

Dividing two ints will always result in an int and 'chop' off the floating point part.  You're on the right track with your cast....

results = (double)adj_gain_value / (double)adaptive_gain_value

[menchar]

I think you only need to cast one of the ints to double, the compiler wil promote everything else  in the expression to match.

Stroustrop says most casts are evidence of a design error 🙂

Menchar

[ASIC_LabRat]

HA!

you guys are TOO funny... thanks, the cast system works in this instance.... 🙂