题解 | #求int型正整数在内存中存储时1的个数#

public class Program {
    public static void Main() {
        string line = System.Console.ReadLine ();
        int num = System.Convert.ToInt32(line);
        int vector = 1;
        int res = 0;
        while(vector!=0){
            if((num|vector) ==num){
                res++;
            }
            vector = vector<<1;
        }
        System.Console.WriteLine(res);
    }
}