Problem with Absolute Value Comparison

[joatmon]

I'm having trouble with the abs function. I have two variables - my_abs_minimum and r, both are type double. I need to compare my_abs_minimum to the absolute value of r. Here is what I am doing:

if ((my_abs_minimum > double abs (r)) || (my_length == 1)) 
            my_abs_minimum = double abs (r);

I'm getting two errors:
'expected primary expression before "double"'
and
"expected ')' before ';' token"

I've played with this every way that I can think of, but I can't get it to compile. Can anyone help? Thanks.

[wolfgang]

Remove the word double in both instances?

[joatmon]

That's how this whole thing started. Without the word double, I get this warning:

"passing 'double' for converting 1 of 'int abs(int)'"

I researched the abs function and found that I needed the double to prevent it from converting back to an integer. At least, that was my conclusion, for better or worse.

[wolfgang]

Oh you're using the cmath abs? or the math.h abs?

Also what compiler and IDE are you using?

[joatmon]

cmath. IDE is wxDev-C++

[wolfgang]

Can you show us more of your code?

[joatmon]

Not really feasible. This is part of a fairly long class implementation and I don't know how to strip the code to something that would make the issue any simpler.

I figured out a way to solve it. Rather than mess around with casting the abs function as double, I changed my abs function call from abs to fabs. I found something that says that that is what you do when your argument is double rather than int.

It works now. Thanks for your help!