CodeWarrior for MCUのトピックRe: problems with sqrt() function

problems with sqrt() function

Franklin — Sat, 31 May 2008 01:02:37 GMT

I am trying to do the following calculation

location[3] = isqrt((dist_3^2)-((location[1])^2)-(location[2])^2);

and I get

Error C1826: Integer-expression expected

Error C5002: Illegal type

Error C1829: +- Incompatible types

among others.

"location" is a double, and "dist_3" is an int.

I put a line, #include "math.h" at the top of my code...

kef — Sat, 31 May 2008 03:50:31 GMT

location[3] = isqrt((dist_3^2)-((location[1])^2)-(location[2])^2);

XORing with double is something :smileyhappy:

Regards

Message Edited by kef on 2008-05-30 11:51 PM

CompilerGuru — Sat, 31 May 2008 05:10:12 GMT

To compute the square, multiply it with itself,
dist_3^2 does toggle the second last bit :smileyhappy:.
So try dist_3*dist_3 instead.

Daniel

Lundin — Mon, 02 Jun 2008 13:30:36 GMT

There is also the pow() function which works for float numbers.