HJ15 求int型正整数在内存中存储时1的个数

我就是我 2024-03-27 16:09 57阅读 0赞

> [牛客华为机试题库【题号 HJ开头】（重点看）][HJ]  
> [牛客在线编程算法篇【题号NC开头】][NC]  
> [剑指offer【题号 JZ开头】][offer_ JZ]  
> [力扣][Link 1]

### 1）[原题链接][Link 2] ###

### 2）[已有题解][Link 3] ###

### 3）代码 ###

package binary;
    
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    
    import static java.lang.Integer.parseInt;
    import static java.lang.System.in;
    
    /**
     * HJ15 求int型正整数在内存中存储时1的个数
     */
    public class HJ15Count1InInteger {
        
        public static void main(String[] args) throws IOException {
        
            BufferedReader bf = new BufferedReader(new InputStreamReader(in));
            int num = parseInt(bf.readLine());
            bf.close();
    
            String str = Integer.toBinaryString(num);
            char[] chars = str.toCharArray();
            int res = 0;
            for (int i = 0; i < chars.length; i++) {
        
                if ('1' == chars[i]) {
        
                    res++;
                }
            }
            System.out.println(res);
        }
    }

[HJ]: https://www.nowcoder.com/exam/oj/ta?tpId=37
[NC]: https://www.nowcoder.com/exam/oj
[offer_ JZ]: https://www.nowcoder.com/exam/oj/ta?page=1&tpId=13&type=13
[Link 1]: https://leetcode.cn/problemset/all/
[Link 2]: https://www.nowcoder.com/practice/440f16e490a0404786865e99c6ad91c9?tpId=37&tqId=21238&rp=1&ru=/exam/oj/ta&qru=/exam/oj/ta&sourceUrl=/exam/oj/ta?tpId=37&difficulty=undefined&judgeStatus=undefined&tags=&title=
[Link 3]: https://juejin.cn/post/7107612669019947044