pow() and modulus trouble
Hi I am programming in C,
and when I do a pow function such as num = pow(28,7); If num is a float or a double, the correct answer is achieved, but if it is an int or a long, num is assigned an incorrect answer. Which gives me a problem because I then what to do num%33. Like I said if I do it, when num is an int, the answer is incorrect. and if I keep num as a double or float, I get the error: illegal use of floating point in function..... Is there anyway to overcome this? It is driving me mad!! :eek: 
Re: pow() and modulus trouble
Its not the problem with the pow but its just long size is not big enough to hold the data.
long iTemp = (long)pow(28,7); This should avoid all the errors and warning but the out put is not correct because the actual output is 13492928512 which is more than 2^32. 
Re: pow() and modulus trouble
ahh thanks anyway, I guess there is nothing I can really do then to get the correct answer.

Re: pow() and modulus trouble
actually I found a way to do it :) ty

Re: pow() and modulus trouble
Why dont you share that with us.

Re: pow() and modulus trouble
Sorry! of course, its a bit long, but I got the answer I needed. Just a bit of maths.
Instead of doing modulus 33... I used a float, say float num1, and found pow(28,7) I then divided it by 33, I then assigned this answer to a long/int, which automatically trunicates it, say long num2 I then again assigned it back to a float, and multiplied this float by 33. say float num3 Then i did num1  num3 which give me the same answer as pow(28,7)%33 should have given me. Not the best at explaining! :) 
All times are GMT +5.5. The time now is 01:51. 