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package LanQiaoOJ;
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//使用按位运算符
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import java.util.Scanner;
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public class 二进制中1的个数3 {
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public static void main(String[] args) {
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Scanner sc=new Scanner(System.in);
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int n=sc.nextInt();
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int count=0;
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while(n>0) {
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if((n&1)==1)
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count++;
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n>>=1;
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}
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System.out.print(count);
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}
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}
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