check-bit.md

Check bit

Problem Description

You are given two integers A and B.

• Return 1 if B-th bit in A is set
• Return 0 if B-th bit in A is unset

Note: The bit position is 0-indexed, which means that the least significant bit (LSB) has index 0.

Problem Constraints

1 <= A <= 10^9
0 <= B <= 30

Input Format

First argument A is an integer.
Second argument B is an integer.

Output Format

Return an integer.

Example Input

Input 1:
A = 4
B = 1

Input 2:
A = 5
B = 2

Example Output

Output 1:
0

Output 2:
1

Example Explanation

Explanation 1:
Given N = 4 which is 100 in binary. The 1-st bit is unset so we return 0

Explanation 2:
Given N = 5 which is 101 in binary. The 2-nd bit is set so we return 1

Output

function checkBit(A, B){
        if((1 << B) & A){
            return 1
        }else{
            return 0
        }
}