2 replies to this topic

[oli4gate]

Hi, I'm new to Netduino and C#

 

in my first project I have a casting problem.

 

this code :

byte checkSum = 0 ;byte[] dataFrame = new byte[5];checkSum = dataFrame[2] ^ dataFrame[3];

gives me this error : 

Cannot implicitly convert type 'int' into 'byte'. An explicit conversion exists (are you missing a cast?) 

 

 

but, this way, it works

byte checkSum = 0 ;byte[] dataFrame = new byte[5]; checkSum  = dataFrame[2];checkSum ^= dataFrame[3];

does anybody know why the first code doesn't work.

I would prefer to use only one line of code instead of two for this operation, and like to understand what went wrong?

 

tx,

Olivier

 

[Chris Walker]

Hi Olivier, Try this:

byte checkSum = 0 ;byte[] dataFrame = new byte[5];checkSum = (byte)(dataFrame[2] ^ dataFrame[3]);

By explicitly casting the XOR result to a byte, the compiler will know that you are intentionally XOR'ing the two values within the limitations of the 8-bit byte type. Welcome to the Netduino community, Chris

[oli4gate]

Thanks for the answer, Chris.

 

I tried your solution and it works fine!

 

Olivier