topic Re: Floating point division in 8-bit Microcontrollers

Floating point division

woohoo — Thu, 02 May 2013 19:38:30 GMT

Hi,

I am using a GT16A microcontroller and am having issues when dividing 2 numbers that would form a floating point number. There is no problem with addition, subtraction and multiplication.

For example, 20/8 gives me a value of 2.0 and not the expected 2.5

I have tried increasing the stack size and I still haven't managed to figure out what is causing the problem. Any ideas?

Re: Floating point division

kef — Thu, 02 May 2013 20:02:47 GMT

float f:

f = 20/8;

20 and 8 both are integers, division produces integer result, and then you request to convert integer 2 to float. To get 2.5 at least one of dividers has to be FP.

Re: Floating point division

ZhangJennie — Fri, 03 May 2013 08:40:51 GMT

1. you need have floating lib support. when creates new project, choose floating library support for your project.

2. do like this:

float f;

f= (float)20/(float)8;