Convert a piece of C++ to Java

[kepler]

Hello,

I'm having some difficulty in converting this piece of C++ code to Java. Can someone help me? As far as I know, "There are no gotos or labels in Java".


double splint(double xa[], double ya[], double y2a[], int n, double x)

{
int k, khi, klo;
double h, a, b;

klo = 1;
khi = n;

st: if (khi - klo > 1)
{
k = (int) ((khi + klo) / 2.0);
if (xa[k] > x)
khi = k;
else
klo = k;
goto st;
}
h = xa[khi] - xa[klo];
a = (xa[khi] - x) / h;
b = (x - xa[klo]) / h;
return (a * ya[klo] + b * ya[khi] + ((pow(a,3) - a) * y2a[klo] + (pow(b,3) - b) * y2a[khi]) * (pow(h,2)) / 6);

}

Kind regards,

Kepler

[SurfMan]

Java has labels, but no goto's.

This label/goto construct is likely convertable to a while-loop. The pow() function has a replacement in the Math class. Other than that, it's nearly Java compatible.

[kepler]

Hi,

Could you help me out in the translation? ONLY if you have the time, of course.

Kind regards,

Kepler

[JosAH]

Simply change this structure:

st: if ( ... ) {
   ...
   goto st;
}

to this:

while ( ... ) {
   ...
}

kind regards,

Jos

[KevinWorkman]

Generally, you don't "translate" code directly from one language to another. You don't go line-by-line trying to figure out how to do each line one at a time.

Instead, you take code in one language and figure out what it's doing, and then you start over and figure out how to do that in the other language.

So, the first question you need to answer is: what does this code do?

[kepler]

Thanks JosAH !!!
It worked like a charm

Kind regards,

Kepler

[JosAH]

Hm, strange: the forum software skips the right square bracket from the '[code]' tag (it is there) ... stupid forum software ...

Jos

[Norm]

The ] was missing when I edited it. I restored it and it's working for me now.

[JosAH]

The ] was missing when I edited it. I restored it and it's working for me now.

Strange, I could and would've sworn I saw a right square bracket when I wanted to edit my reply; and I wasn't even boozing yet ;-) Thanks for fixing it.

kind regards,

Jos

[Tolls]

... and I wasn't even boozing yet ;-) Thanks for fixing it.

kind regards,

Jos

You stop?

[gimbal2]

You stop?

He switches between boozing and "sampling".

[JosAH]

You stop?

Yes, on a daily basis.

kind regards,

Jos

[DarrylBurke]

/takes a swig of beer

Cheers!

db