I have a quick question about using modulus arithmetic in calculations involving float variables. What data type should I use? I am trying to perform the following calculation, but I am getting a illegal error. Any sugge
stions would be appreciated.

code:
I am getting the following error:

CODE.cpp(42) : error C2296: '%' : illegal, left operand has type 'float'
Error executing cl.exe.

Thanks,

ewallo

Hi Ewallo. One quick thing, when you post c/c++ code if you start it with [c] and end it with [/c] it will highlight your code and make it much more readable

C/C++ makes some assumptions about your results unless you use typecasting, so when you perform:


C defaults to give you a floating result. In order to perform integer division, you need to typecast your result as so:


Try something more like this


Also, WaltP has justed posted an excellent thread here wherein he talks a bit about parenthesis. If you get a chance it helps for *human* readability.

Good luck

dsmith,

Thanks for the reply. I will give it a try. I will also make sure to mark my code correctly next time. Thanks again!!

The error is because the % operator only works on integers. To deal with floating point values, use the fmod() function from math.h, which takes two doubles.

fmod(13.0, 2.25) is 1.75
fmod(13.0, 2.50) is 0.5