log equation to simplifed for microcontroller

[pany2008]

Hi,

I want the programming code for following equation
logb(x) :- b(base) will be 10 fixed and x will vary from 0 to 1000,
i want the log result of x, where the result i want in 3 decimal point example log(500) = 2.698, x is my adc count from 0 to 1000.
If any one can help me out for the code for pic microcontroller(pic16f877a) i am using the hitech complier.

 

[hussain_kiet]

you can use Log10 function by including math.h.....

 

[pany2008]

you can use Log10 function by including math.h.....

Thanks for reply, i have tried but it doesn't provide the decimal value.

 

[hussain_kiet]

yes it returns the float value.
if you want to avoid the trailing numbers after the point you can use round() function...