Using Else with blank If

[PIEBALDconsult]

CleaKO wrote:

If boolean = True

But then you may have trouble when the code is ported to C, so you really need: If True = boolean

--| "Every tool is a hammer." |--

[Hal Angseesing]

Yep, done this myself. And debugger conditional breakpoints are actually quite a lot slower than IP traps.

[John R Shaw]

It is a good idea to place the constant value to the left of the equality symbol in any language that supports them, to catch syntax errors. It just feels so unnatural to type it that way. ;)

INTP "Program testing can be used to show the presence of bugs, but never to show their absence."Edsger Dijkstra

[John R Shaw]

jhwurmbach wrote:

But then, the whole VB code gives me a screaming fit anyway.

I know the feeling. ;)

INTP "Program testing can be used to show the presence of bugs, but never to show their absence."Edsger Dijkstra

[Shog9 0]

You might still have trouble in C, if you run up against code that uses other non-zero values for "true"...

----

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[AncientCodeslinger]

If that's how you use booleans, you might as well just use an integer set to 1 or 0 or a string set to "Y" or "N" (or "True" or "False"). How about: somethingIsWrong = (type <> "GOOD" AndAlso type <> "Cool") With a variable name that clearly expresses the condition represented by the boolean, the comparison to True or False becomes clearly redundant.

[Graham Bradshaw]

Well, if the condition is to test the equality of two variables,

bool b;

if (x = y)
{
b = true;
}
else
{
b = false;
}

will give you a compiler warning, and

bool b = (x = y);

will not. (Note the assignment vs equality test bug)

[Kevin McFarlane]

It's also quite common. I often find myself starting with the first one, then after testing, stepping through, etc., I refactor to the second.

Kevin

[Kevin McFarlane]

The reason for the first is that some people have a fixation about negative conditionals, such that they will try and avoid them at all costs - such as the cost you describe!

Kevin

[Kevin McFarlane]

jhwurmbach wrote:

But then, the whole VB code gives me a screaming fit anyway.

But you see such style in the C-family languages too, though it's probably less common.

Kevin

[Roger Bamforth]

That's a good point and is actually something that had never occurred to me. However, whether or not you get a warning depends upon the types of x, y and b is not as simple as it seems. It is probably also language and compiler dependant. e.g in Visual C++

bool x = true;
bool y = true;
bool b = (x = y);

gives no warning, as you say, but

int x = true;
int y = true;
bool b = (x = y);

does generate a warning (forcing an int to be a bool) and

int x = true;
int y = true;
BOOL b = (x = y);

doesn't.

Regards - Roger

[Ennis Ray Lynch Jr]

If there is a complicated method and I want to indicate that I did indeed accomodate both possibilities I will, ocassionaly, leave a blank if. However, I almost never check a boolean variable against a boolean and instead prefer : if(isFlagSet){ //Some commented out code or not about //Why not used } else if(!isFlagSet){ //Some Actual code ... } else{ //File Not Found } Just kidding with the File not found!

---

File Not Found

[peterchen]

boolean = True but that's a boolean expression again, which could be true.. or false. So to make absoultely clear you want b = true to be true (not false), you write If (boolean = True) = True lather, rinse, repeat :rolleyes:

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[D111]

Shouldn't it be: bool b = (x == y); ---------- bool b = (x = y); would set x to y and then b to x

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