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int v = b ? (a ? 1 : 2) : (a ? 0 : 1);

EDIT #1:

As per svick, parsed out conditional operator on separate lines:

int v = b
 ? (a ? 1 : 2)
 : (a ? 0 : 1);

EDIT #2:

Here's one I don't like, but it has no branching whatsoever:

int v = Convert.ToInt32(b) + Convert.ToInt32(!a);

int v = b ? (a ? 1 : 2) : (a ? 0 : 1);

EDIT #1:

As per svick, parsed out conditional operator on separate lines:

int v = b
 ? (a ? 1 : 2)
 : (a ? 0 : 1);

EDIT #2:

Here's one I don't like, but it has no branching whatsoever:

int v = Convert.ToInt32(b) + Convert.ToInt32(!a);

v = b ? (a ? 1 : 2 ) : (a ? 0 : 1);

int v = b ? (a ? 1 : 2) : (a ? 0 : 1);

EDIT #1:

As per svick , parsed out conditional operator on separate lines:

int v = b
 ? (a ? 1 : 2) : (a ? 0 : 1);

EDIT #2:

Here's one I don't like, but it has no branching whatsoever:

int v = Convert.ToInt32(b) + Convert.ToInt32(!a);