题解 | #查找输入整数二进制中1的个数#

let str;
while(str = readline()){
  let two = parseInt(str).toString(2);
  let arr = two.split('');
  let num = 0;
  arr.forEach((v)=>{
    if(v == '1'){
      num++;
    }
  })
  console.log(num)
}