Bit operation.

Question

What does b/a?a:b mean?
Where a and b are integers.

Answer 1

That is called a ternary operator.
If b/a is greater than 0 than it will assign the value of "a" to the variable or if b/a is 0 then it will assign the value of "b" to the variable.

It is a simple if else statement.

Answer 2

This is not bit operation.
It is ternary operator syntax with
(IF Condition is true) ? (Do this) : (Else Do this);