using break;???

[David]

I know that by some reasons... the use of "break;" in java language is not
correct, is there any similar problems with c#????

[Jon Skeet [C# MVP]]

David <Da***@discussi ons.microsoft.c omwrote:

I know that by some reasons... the use of "break;" in java language is not
correct, is there any similar problems with c#????

What do you mean by "not correct"?

--
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http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[David]

Something like this:

break is used only for switch statement control.

Reasoning: Using break, other than for switch statement control, makes it
difficult to later break a construct into smaller constructs or methods. It
also forces the developer to consider more than one end point for a
construct.

"Jon Skeet [C# MVP]" wrote:

David <Da***@discussi ons.microsoft.c omwrote:

I know that by some reasons... the use of "break;" in java language is not
correct, is there any similar problems with c#????

What do you mean by "not correct"?

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[Greg Young]

public static int[] CopyWithSquare( int[] val) {
int[] ret = new int[val.Length];
for (int i = 0; ; i++) {
ret[i] = val[i] * val[i];
if (ret[i] 200) {
break;
}
}
return ret;
}

relevant disassembly ... This looks about like what I would expect ... it
generates a compare + a jump out of the loop lines 32 + 3a

for (int i = 0; ; i++) {
00000015 xor edx,edx
00000017 mov ecx,dword ptr [ebp+4]
0000001a mov ebx,dword ptr [edi+4]
ret[i] = val[i] * val[i];
0000001d cmp edx,ecx
0000001f jae 00000048
00000021 mov esi,dword ptr [ebp+edx*4+8]
00000025 mov eax,esi
00000027 imul eax,esi
0000002a cmp edx,ebx
0000002c jae 00000048
0000002e mov dword ptr [edi+edx*4+8],eax
if (ret[i] 200) {
00000032 cmp dword ptr [edi+edx*4+8],0C8h
0000003a jg 00000041
for (int i = 0; ; i++) {
0000003c add edx,1
0000003f jmp 0000001D
break;
}
}

Cheers,

Greg Young
MVP - C#
http://codebetter.com/blogs/gregyoung
"Jon Skeet [C# MVP]" <sk***@pobox.co mwrote in message
news:MP******** *************** *@msnews.micros oft.com...

David <Da***@discussi ons.microsoft.c omwrote:

>I know that by some reasons... the use of "break;" in java language is
not
correct, is there any similar problems with c#????

What do you mean by "not correct"?

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[Greg Young]

As a general rule it is a good one but there are some cases where breaks
come in really handy.

It is similar to but not as extreme as the goto case it is best to avoid
them if possible but there are times where it can really help.

Cheers,

Greg
"David" <Da***@discussi ons.microsoft.c omwrote in message
news:17******** *************** ***********@mic rosoft.com...

Something like this:

break is used only for switch statement control.

Reasoning: Using break, other than for switch statement control, makes it
difficult to later break a construct into smaller constructs or methods.
It
also forces the developer to consider more than one end point for a
construct.

"Jon Skeet [C# MVP]" wrote:

>David <Da***@discussi ons.microsoft.c omwrote:

I know that by some reasons... the use of "break;" in java language is
not
correct, is there any similar problems with c#????

What do you mean by "not correct"?

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[Jon Skeet [C# MVP]]

David <Da***@discussi ons.microsoft.c omwrote:

Something like this:

break is used only for switch statement control.

No, break can be used in while, do/while, and for statements in both
Java and C#. You *may* choose not to use it other than for switch
statements, but it's a matter of taste.

Reasoning: Using break, other than for switch statement control, makes it
difficult to later break a construct into smaller constructs or methods. It
also forces the developer to consider more than one end point for a
construct.

However, it also means you don't have to code all code paths within the
loops to go through the whole loop body. There are various situations
where using break makes the code simpler rather than more complicated,
and I would fight against any "rule" telling me never to use it.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[Kevin Spencer]

I often use a break statement in a for loop for that looks for something I
need the index of. The index continues to increment until the item is found.
When it finds the item, it breaks. Afterwards, the value of the index is the
index in the array or Collection of the item, or, if it is equal to the
total count, the item was not found.

--
HTH,

Kevin Spencer
Microsoft MVP
Chicken Salad Surgery

Who is Mighty Abbott? A twin-turret scalawag.

"Jon Skeet [C# MVP]" <sk***@pobox.co mwrote in message
news:MP******** *************** *@msnews.micros oft.com...

David <Da***@discussi ons.microsoft.c omwrote:

>Something like this:

break is used only for switch statement control.

No, break can be used in while, do/while, and for statements in both
Java and C#. You *may* choose not to use it other than for switch
statements, but it's a matter of taste.

>Reasoning: Using break, other than for switch statement control, makes it
difficult to later break a construct into smaller constructs or methods.
It
also forces the developer to consider more than one end point for a
construct.

However, it also means you don't have to code all code paths within the
loops to go through the whole loop body. There are various situations
where using break makes the code simpler rather than more complicated,
and I would fight against any "rule" telling me never to use it.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too