CODEWITHSUNDEEP
c#
L. Ahmad
L. Ahmad

Reputation: 21

Operator "&&" cannot be applied to operands of type 'int' and 'int'

I dont know what is the different these two code. Above only have single & while below have &&. I have an error for the above code. I dont how to solve it. 

Cmd3[8] = (byte)(Length & 0xFF);
Cmd3[9] = (byte)(((Length >> 8) && 0xFF) ? -1 : 0);

Hope you guys can help me.

Upvotes: 2

Views: 1562

Answers (2)

Dmitrii Bychenko
Dmitrii Bychenko

Reputation: 186833

You, probably, mean bitwise And: &; another issue is that unlike C, C# doesn't implicitly convert integer 0 into bool false, and, finally, (byte) -1 conversion can cause OverflowException:

// since -1 is out of byte range and you don't want exception to be thrown
// you have to (in general case) put "unchecked" to allow integer overflow 
unchecked { 
  ...
  Cmd3[8] = (byte)(Length & 0xFF);
  // != 0: C# can't convert int 0 into bool false
  // &:    bitwise And (not logical one)
  Cmd3[9] = (byte)(((Length >> 8) & 0xFF) != 0 ? -1 : 0); // -1 can cause integer overflow
  ...
}

Upvotes: 2

K. Berger
K. Berger

Reputation: 361

The difference is that a single & is a bitwise AND, while && is a boolean operator (which can only be applied to boolean operands). You probably want the code to use single &.

Upvotes: 1

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