I have a custom function which accept short as parameter.
for example:
public void myFun(short myShor)
{...}
Now I have a integer (int i), I want to take as the aprameter of myFun,
How can I cast i to short ? 4 30696
ad <fl****@wfes.tc c.edu.tw> wrote: I have a custom function which accept short as parameter. for example:
public void myFun(short myShor) {...}
Now I have a integer (int i), I want to take as the aprameter of myFun, How can I cast i to short ?
myFun ((short)i);
--
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] wrote: ad <fl****@wfes.tc c.edu.tw> wrote: public void myFun(short myShor) {...}
Now I have a integer (int i), I want to take as the aprameter of myFun, How can I cast i to short ?
myFun ((short)i);
Note that, by default, C# checks for integer overflow when performing a cast
in this obvious way. If you prefer to truncate the most significant bits,
you either need to remove them beforehand using a bitmask or perform the
cast inside an "unchecked {}" block. You can read more about unchecked here: http://msdn.microsoft.com/library/de...funchecked.asp
--
Derrick Coetzee, MCAD, MSFT (Speech Server)
This posting is provided "AS IS" with no warranties, and confers no
rights.
Derrick Coetzee [MSFT] <dc******@onlin e.microsoft.com > wrote: myFun ((short)i);
Note that, by default, C# checks for integer overflow when performing a cast in this obvious way. If you prefer to truncate the most significant bits, you either need to remove them beforehand using a bitmask or perform the cast inside an "unchecked {}" block. You can read more about unchecked here:
http://msdn.microsoft.com/library/de...ary/en-us/csre f/html/vclrfunchecked. asp
No, by default C# *doesn't* check for overflow, except for compile-time
constant expressions. So:
// Doesn't compile
uint x = (uint)-1;
// Does compile
uint x = unchecked((uint )-1);
// Compiles and runs without exception
int y = -1;
uint x = (uint)y;
// Compiles but throws an exception
int y = -1;
uint x = checked((uint)y );
Note that the default behaviour can also be controlled by a compiler
switch or project setting.
--
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] wrote: Derrick Coetzee [MSFT] <dc******@onlin e.microsoft.com > wrote: myFun ((short)i);
Note that, by default, C# checks for integer overflow when performing a cast in this obvious way. [...]
No, by default C# *doesn't* check for overflow, except for compile-time constant expressions.
Sorry, my mistake - I'm used to this option being on. I do personally
recommend that the /checked option (Build->Advanced->Check for arithmetic
overflow/underflow) is always used, as this can help to find bugs and
prevent potential security issues, as well as provide conceptual safety
guarantees (and I think it should be on by default). If profiling reveals
that they're slowing down a bottleneck, or if you want the C behaviour of
arithmetic mod 2^word size, you can always wrap the relevant code in
unchecked { }. Thanks for the correction, Jon.
--
Derrick Coetzee, MCAD, MSFT (Speech Server)
This posting is provided "AS IS" with no warranties, and confers no
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