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Question by squigglyo · May 02, 2015 at 03:48 PM · c#mathfloat

Why can't I add to a float?

Im not able to add small numbers to my float.

For example, ive got a float thats set to 10,000,000

If I add 3 to it, nothing changes. If I add 3,000,000 it does.

What do I need to do to make sure this kinda thing doesnt happen?

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avatar image hbalint1 · May 02, 2015 at 03:57 PM 0
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this shouldn't happen. Show us the piece of code where this happens.

avatar image squigglyo · May 02, 2015 at 04:05 PM 0
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 print(totalGold + " : " + GetPayout (heroID,taskID));
 //GetPayout returns 3
 //total Gold is set to 10,000,000 but prints as 1E+07
 
 totalGold += GetPayout (heroID,taskID);
 
 print(totalGold + " : " + GetPayout (heroID,taskID));
 //no difference in the print out or in the textbox that shows the number.
 
avatar image hbalint1 · May 02, 2015 at 04:21 PM 0
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when you cast a float or double to string it will use scientific values(1E+07). if it prints 1E+07 at the second time, it doesn't mean you calculation is wrong, it's just a rounding. try printing it like this:

 print(totalGold);
 totalGold += GetPayout (heroID,taskID); 
 print(totalGold);

still get the same results?

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Answer by siaran · May 02, 2015 at 04:25 PM

This has to do with the (lack of) accuracy of floats. I won't go into the details here, but floats are generally accurate withing 7 digits.

10,000,000 is 8 digits long, and adding 3 only affects the last digit, which is outside the accuracy range. Adding 3,000,000 affects digits well withing the 7 digit accuracy range on 10,000,000.

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avatar image siaran · May 02, 2015 at 04:28 PM 0
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if you need higher accuracy, you should consider using double or decimal type ins$$anonymous$$d of float.

avatar image squigglyo · May 03, 2015 at 02:09 AM 0
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I thought something like that might be the case. THanks Siaran, ill switch over to using a double

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