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!!
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.
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!
