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C++1级考试真题参考答案(2023年12月)

  • 2026-03-12 14:20:48
C++1级考试真题参考答案(2023年12月)

第 1 题

输入一个整数和双精度浮点数,先将浮点数保留2位小数输出,然后输出整数。输入一行两个数,分别为整数N(不超过整型范围),双精度浮点数F,以一个空格分开。输出一行两个数,分别为保留2位小数输出的F,以及整数N,以一个空格分开。

我的答案:

#include<iostream>#include<iomanip>using namespace std;intmain(){int N;double F;	cin>>N>>F;	cout<<fixed<<setprecision(2)<<F<<" "<<N<<endl;return 0}

第 2 题 

两个整数a和b分别作为分子和分母,既分数 a/b ,求它的浮点数值(双精度浮点数,保留小数点后9位) 输入仅一行,包括两个整数a和b(b不为0) 输出也仅一行,分数 a/b 的浮点数值。

我的答案:

#include<iostream>#include<iomanip>// 必须包含此头文件,否则 setprecision 未定义using namespace std;intmain(){    int a, b;    double F;    cin >> a >> b;    // 关键点: 1.0*a 强制转换为浮点数运算    F = 1.0 * a / b;     // 关键点: fixed 与 setprecision 配合控制小数位数    cout << fixed << setprecision(9) << F << endl;    return 0}

第 3 题 

输入一个字符,如果输入的字符是数字,输出yes, 否则输出no

我的答案:

#include<iostream>using namespace std;intmain(){    char ch;    cin >> ch;    // 核心判断:字符ch的ASCII码是否在‘0’到‘9’之间    if (ch >= '0' && ch <= '9') cout << "yes" << endl;    else cout << "no" << endl;    return 0;}

第 4 题

给定一个数的序列S,以及一个区间[L, R], 求序列中介于该区间的数的个数,即序列中大于等于L且小于等于R的数的个数。第一行3个整数n、L、R,分别表示序列的长度,区间的左端点,区间的右端点。(0 < n ≤ 10000, 1 ≤ L ≤ R≤ 1000000) 第二行n个正整数,表示序列里的每一个数,每个数小于等于10000000。输出一个整数,表示序列中大于等于L且小于等于R的数的个数。

我的答案:

#include<iostream>using namespace std;intmain(){    int n, L, R, cnt = 0;    cin >> n >> L >> R;    for(int i = 1; i <= n; i++)    {        int num;        cin >> num;        if(num >= L && num <= R) cnt++;    }    cout << cnt << endl;    return 0}

第 5 题 

假设有N个硬币(N为不大于5000的正整数),从1到N按顺序依次编号,初始时全部处于正面向上的状态;有M个 人(M为不大于N的正整数)也从1到M依次编号。第一个人(1号)将硬币全部翻转一次,第二个人(2号)将编号为2的倍数的硬币翻转一次,第三个人(3号)将编号为3的倍数的硬币翻转一次。依照编号递增顺序,以后的人都和3号一样,将凡是自己编号倍数的硬币翻转一次。请问:当第M个人操作之后,哪些硬币是正面向上的,按从小到大输出其编号,以空格分开。输入正整数N和M,以单个空格隔开。顺次输出正面向上的硬币的编号,其间用空格间隔。

我的答案:

#include<iostream>using namespace std;intmain(){    int N, M;    cin >> N >> M;    bool coins[5005];     for(int i = 1; i <= N; i++) coins[i] = true// 初始化    for(int i = 1; i <= M; i++)    {        // 内层循环:j 从 i 开始,每次增加 i,即遍历 i 的倍数        for(int j = i; j <= N; j += i)        {            coins[j] = !coins[j]; // 状态取反:开变关,关变开        }    }    // 输出处理:利用标志位控制空格    bool start = true;    for(int i = 1; i <= N; i++)    {        if(coins[i])         {            if(start == false)            {                cout << " "// 后续元素前输出空格            }            cout << i;            start = false;        }    }    cout << endl;    return 0;}

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  1. CONNECT:[ UseTime:0.000520s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000761s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000316s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000282s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000489s ]
  6. SELECT * FROM `set` [ RunTime:0.000200s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000588s ]
  8. SELECT * FROM `article` WHERE `id` = 464220 LIMIT 1 [ RunTime:0.000724s ]
  9. UPDATE `article` SET `lasttime` = 1773367997 WHERE `id` = 464220 [ RunTime:0.000722s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000246s ]
  11. SELECT * FROM `article` WHERE `id` < 464220 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000463s ]
  12. SELECT * FROM `article` WHERE `id` > 464220 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002734s ]
  13. SELECT * FROM `article` WHERE `id` < 464220 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004439s ]
  14. SELECT * FROM `article` WHERE `id` < 464220 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000785s ]
  15. SELECT * FROM `article` WHERE `id` < 464220 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001433s ]
0.085187s