Re: Why can't I Run > Fix?
Re: Why can't I Run > Fix?
- Subject: Re: Why can't I Run > Fix?
- From: Markian Hlynka <email@hidden>
- Date: Thu, 21 Jan 2010 23:31:46 -0700
On 21-Jan-10, at 13:38 , Fritz Anderson wrote:
Xcode 3.1.2, Mac OS X 10.6.2
I find that when I edit a function that is paused in the debugger,
the Run > Fix menu item is inactive. I don't understand why.
Here is the function (abbreviated):
===
void doRegression(void)
{
int nScanned;
int n;
double sumX, sumY;
double sumX2, sumY2;
double sumXY;
n = 0;
// Replace this:
sumX = sumX2 = sumY2 = sumXY = 0.0;
// With this:
// sumX = sumY = sumX2 = sumY2 = sumXY = 0.0;
do {
double x, y;
nScanned = scanf("%lg %lg", &x, &y);
// ...
} while (nScanned == 2);
// ...
}
To my eye, this is a terrible method of initialization, and poor read-/
maintain-ability as well; Initializations for simple functions should
be done in the declaration (unless it's a class/struct and you use a
proper initializer list):
double sumX = 0.0;
If you need to initialize them in the code, just because you CAN run
them together doesn't mean you should. Will your terminal run out of
vertical lines? :-) If you write the more painful:
sumX = 0.0;
sumY = 0.0;
sumY2 = 0.0;
sumXY = 0.0;
it takes a couple lines and is WAY easier to read. Plus, when you
discover in 3 months that you need different initial values you aren't
going to THEN break it into separate lines and introduce a typo that
takes you a week to track down.
Am I off base, or do the rest of you agree?
Markian
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