test.sol

pragma solidity ^0.6.2;

contract Test {
    
    function test1() external {
        numOfPeaks(200);        
    }
    
    function test2() external {
        numOfPeaks2(200);        
    }

    function numOfPeaks(uint256 width) public pure returns (uint256 num) {
        uint256 bits = width;
        while (bits > 0) {
            if (bits % 2 == 1) num++;
            bits = bits >> 1;
        }
        return num;
    }
    
    
    function numOfPeaks2(uint256 width) public pure returns (uint256 num) {
        uint256 bits = width;
        while (bits > 0) {
            if (!(bits % 2 == 0)) num++;
            bits = bits >> 1;
        }
        return num;
    }
}