Math problem that won't work
Why won't this work?
Data6 is a variable that ranges from 0 to 127
Light = (Data6/127)*100
I get 0 from 0-126 and 127 gives me 100.
I had a similar issue with another math problem and I'm guessing they are related. I had to use a lookup table to solve this one and if I can get rid of the lookup table it would save me some code space.
T=((DATA4*9/5)+32)*10
I know you can't use decimal points when multiplying but I think you could multiply by 10 and then use the //10 to get the remainder but in this case I'm just getting 0.
Re: Math problem that won't work
Hi,
PBP works with integers only.
1/127=0.0079 which will be truncated to 0, 0*100=0
126/127=0.99 which will be truncated to 0, 0*100=0
127/127=1, 1*100=100
Multiply it by 100 first - then divide it by 127.
126*100=12600, 12600/127=99
Obviously it's not perfect because (1*100)/127 will still return 0
/Henrik.
Re: Math problem that won't work
What if you multiply/divide by more than 100 to pick up extra decimals?
Robert
Re: Math problem that won't work
Quote:
Obviously it's not perfect because (1*100)/127 will still return 0
I'm not making NASA type products here so even if there is a 2 or 3% error, the end user probably wouldn't know. And if they did know, they won't care. That tip worked out great, thanks Henrik.
Quote:
What if you multiply/divide by more than 100 to pick up extra decimals?
The more the merrier but you can't have an amount that is greater than a word sized variable. I've found that in most cases you don't need a long to do decent math.
