C++ floats

Fi_C**

Hi everybody,

I have declared a float sampleSize;
int ii is incremeneting in a for loop so is gonna be numbers like 1, 2, 3, 4, 5, ..etc

float sampleSize = ((ii/1000)*100);

any idea why sampleSize is alwys zero?
I should be getting like .4, .5, etc ...shouldn't I??
please help
luv Fi**

Typedef

integer division of ii maybe?

Fi_C**

thanks , I love you,

float sampleSize = ((ii/1000.0)*100);
that works

Fi

Talliesin

In (ii/1000) ii and 1000 are both ints, so integer division is performed and you get 0. This is then multiplied by 100 (giving you 0) and then finally this is cast to float to give you 0.0.

float sampleSize = ((ii/1000.0)*100); would work (since 1000.0 is a float it with cause ii to be cast to float before the calculation).

For that matter float sampleSize = ii/10.0; would work, and be clear.

Talliesin

Darn my verbose reply and how long it took!

Fi_C**

well thank you anyway Talliesin
Fi**

DeadBankClerk

float sampleSize = ((float)ii/1000.0f)*100.0f;

You don't want to be using doubles!

Talliesin

D'oh!

I'd tested with float sampleSize = ((ii/1000.0f)*100), but that wasn't what I posted

DeadBankClerk

Originally posted by DeadBankClerk

float sampleSize = ((float)ii/1000.0f)*100.0f;

You don't want to be using doubles!

I am also silly.

float samplesize = (float)ii / 10.0f;