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operator precedence issue? [message #699547]

Thu, 21 July 2011 14:34

Eclipse User

The attached source code (lines 61-62) are used to create a graphic drawing as illustrated within Core Java Volume 2 (7th Edition).

However, when walking through the code, I noticed that putting a breakpoint at lines 61/62,and, reading the values does not completely agree with my manual calculation:
...
for (int i = 0; i < width; i++)
for (int j = 0; j < height; j++)
{
double a = XMIN + i * (XMAX - XMIN) / width;
double b = YMIN + j * (YMAX - YMIN) / height;
if (!escapesToInfinity(a, b))
raster.setDataElements(i, j, colorData);
}
return image;
...

XMIN = -2.0
XMAX = 2.0
YMIN = -2.0
YMAX = 2.0

for i = 0 and j = 0

a = -2 + 0 * (2 - (-2)) /400 = -0.02
b = -2 + 0 * (2 - (-2)) /400 = -1.99

When debugging the code Eclipse reads -2.0 for both a and b, as intermediate values. Where am I confused or misled?

Information about Mandrelbot, and, the rationale behind these formulae would be appreciated.

Complete source code which is sourced from Core Java Volume 2 (7th Edition) is attached to reproduce the issue.

Is this a bug or a misunderstanding?

Attachment: MandelbrotTest.java
(Size: 2.34KB, Downloaded 691 times)

[Updated on: Fri, 22 July 2011 01:55] by Moderator

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