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C++1级考试真题参考答案(2023年3月)

  • 2026-03-11 02:41:33
C++1级考试真题参考答案(2023年3月)

第 1 题 

给定一个字符,用它构造一个长为4个字符,宽为3个字符的长方形,可以参考样例输出。输入只有一行, 包含一个字符。输出该字符构成的长方形,长4个字符,宽3个字符。

我的答案:

#include<iostream>using namespace std;intmain(){    char ch;    cin >> ch;    // 外层循环控制行数(宽)    for(int i = 1; i <= 3; i++) {        // 内层循环控制列数(长)        for(int j = 1; j <= 4; j++) {            cout << ch;        }        // 每行结束后换行        cout << endl;    }    return 0}
第 2 题 问答题
给出一个长方形的长和宽,求该长方形的面积。假设长为a,宽为b,则面积S=a×b。输入一行,2个正整数,以空格分隔,分别表示长方形的长和宽。长和宽都不大于1000。输出一个整数,即长方形的面积。
我的答案:
#include<iostream>using namespace std;intmain(){    int a, b, S;    cin >> a >> b;    S = a * b; // 核心计算    cout << S << endl;    return 0}

第 3 题

小明想将自己的百分制成绩转换为等级制,请你帮他完成这样的转换。转换规则为:A,90-100 B,77-89 C,67-76 D,60-66 E,0-59

输入一个0 - 100 的整数,输出转换后的等级,一个A-E的大写字母。

我的答案:

#include<iostream>using namespace std;intmain(){    int score;    cin >> score;    // 利用 else if 的互斥特性,从高到低依次判断    // 这种写法简洁且效率高    if(score >= 90) cout << 'A';    else if(score >= 77) cout << 'B';    else if(score >= 67) cout << 'C';    else if(score >= 60) cout << 'D';    else cout << 'E';    cout << endl;    return 0}

第 4 题 

小明的妈妈非常关心小明的成绩,每次考试后都会问小明是否进步了。机智的小明会努力找出之前比这次成绩低的试卷进行比较,如果找到了,他会回答妈妈自己进步了(Y),如果没找到,他只能回答妈妈没进步(N)。已知小明的n次成绩,请问每次妈妈询问小明,小明的回答是怎么样的。

输入为2行,第1行是一个整数n(n < 100),即考试成绩的数量,第二行是n个整数,即每次考试成绩。输入保证n不大于100,考试成绩在0到100之间。输出n行,每行是小明的回答(Y或N)

我的答案:

#include<iostream>using namespace std;intmain(){    int n, score, minScore = 101// 初始化为比最大可能成绩大的数    cin >> n;    for(int i = 1; i <= n; i++) {        cin >> score;        // 核心逻辑:统一处理第一次和后续情况        if(score > minScore) cout << 'Y' << endl;        else {            cout << 'N' << endl;            minScore = score; // 更新历史最低分        }    }    return 0;}

第 5 题 

年号中的每个数之和为20的年号是特殊年号。例如:2099、1991、1892是特殊的年号,而2021则不是。给定一个年号,找出严格大于给定年号的最小特殊年号。

输入年号:整数y(1000≤y≤9000)。输出特殊年号:严格意义上大于y的最小年号,并且它的每个数之和为20。

我的答案:

#include<iostream>using namespace std;intmain(){    int year;    cin >> year;    // 从 year 的下一年开始向后枚举    for(int i = year + 1; ; i++) // 省略中间条件,因为题目保证有解    {        int temp = i; // 关键点:用临时变量保护 i,避免在拆位过程中修改循环变量        int sum = 0;        // 通用拆位逻辑        while(temp) // 当 temp 不为 0 时继续        {            sum += temp % 10// 取出最后一位            temp /= 10;        // 去掉最后一位        }        if(sum == 20)        {            cout << i << endl;            break// 找到第一个就退出,保证是“最小”的        }    }    return 0}

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  1. CONNECT:[ UseTime:0.000955s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001379s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000792s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001569s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001372s ]
  6. SELECT * FROM `set` [ RunTime:0.020612s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001595s ]
  8. SELECT * FROM `article` WHERE `id` = 463673 LIMIT 1 [ RunTime:0.006274s ]
  9. UPDATE `article` SET `lasttime` = 1773172284 WHERE `id` = 463673 [ RunTime:0.010648s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.004176s ]
  11. SELECT * FROM `article` WHERE `id` < 463673 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.007683s ]
  12. SELECT * FROM `article` WHERE `id` > 463673 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.016706s ]
  13. SELECT * FROM `article` WHERE `id` < 463673 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.026557s ]
  14. SELECT * FROM `article` WHERE `id` < 463673 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.026959s ]
  15. SELECT * FROM `article` WHERE `id` < 463673 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008855s ]
0.298477s