Question

I have a very simple problem that is giving me a really big headache in that I am port a bit of code from C++ into C# and for a very simple operation I am getting totally different results:-

C++

char OutBuff[25];       
int i;
unsigned int SumCheck = 46840;

OutBuff[i++] = SumCheck & 0xFF; //these 2 ANDED make 248

The value written to the char array is -8

C#

char[] OutBuff = new char[25]; 
int i;
uint SumCheck = 46840;
OutBuff[i++] = (char)(sumCheck & 0xFF); //these 2 ANDED also make 248

The value written to the char array is 248.

Interestingly they are both the same characters, so this may be something to do with the format of a char array in C++ and C# – but ultimately I would be grateful if someone could give me a definitive answer.

Thanks in advance for any help.

David

Answer 1

Maybe you should be using byte or sbyte instead of char. (char is only to store text chars and the actual binary serialization for char is not the same as in c++. char allows us to store characters without worrying about character byte width.)