How should I practice Swap Even and Odd Bits?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Tesla phone screen problems in FastPrep.

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FastPrep tags this as a Tesla phone screen coding practice problem when the problem catalog has that company and stage context.

Swap Even and Odd Bits

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Problem statement

Given an unsigned 32-bit integer n, swap every bit at an even position with the adjacent bit at the next odd position.

Bit positions are counted from the least significant bit, starting at position 0. Therefore, swap the pairs (0, 1), (2, 3), and so on through (30, 31).

Return the resulting unsigned 32-bit integer.

Function

swapEvenOddBits(n: long) → long

Examples

Example 1

n = 10return = 5

The low four bits of 10 are 1010. Swapping positions (0, 1) and (2, 3) produces 0101, which equals 5.

Example 2

n = 23return = 43

The low six bits of 23 are 010111. Swapping each adjacent pair produces 101011, which equals 43.

Example 3

n = 1return = 2

The set bit at position 0 moves to position 1, so the result is 2.

Constraints

0 <= n <= 2^32 - 1.