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C Conversion

Posted on 2006-10-31
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Last Modified: 2010-04-15
Hello,

I need to convert the following line of code to VB.Net, can anyone explain the syntax please?



next_A1 = next_A1 ^ D ^ ((j % 2) ? in2 : in1);

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Question by:IAJWDDIY
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3 Comments
 
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Accepted Solution

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adg080898 earned 2000 total points
ID: 17846147
^ is a bitwise xor operator. For example, a ^ b will toggle in 'a' any bits set in 'b'.

% is the modulus operator. a % b returns the remainder of dividing 'a' by 'b'.

? selects between two expressions. (a ? b : c) means "if a is true (nonzero), the value of the expression is b, otherwise (a is false or zero), the value of the expression is c.

I don't know VB.net, but this should get you close enough:

// pseudo basic conversion of "next_A1 = next_A1 ^ D ^ ((j % 2) ? in2 : in1);"

tmp = next_A1
    // The following evaluates "next_A1 ^ D"
tmp = result XOR D
    // The following evaluates "j % 2"
tmp2 = j MOD 2
    // The following evaluates ((j % 2) ? in2 : in1)
if tmp2 <> 0
  tmp3 = in2
else
  tmp3 = in1
endif
   // The following does the final xor
result = result XOR tmp3
next_A1 = result

--------------------------------------
Here is a more compact way:

if (j MOD 2) <> 0
  next_A1 = next_A1 XOR D XOR in2
else
  next_A1 = next_A1 XOR D XOR in1
endif


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Author Comment

by:IAJWDDIY
ID: 17846323

Thank you.

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LVL 8

Expert Comment

by:adg080898
ID: 17846342
My pleasure.
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