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C++1级考试真题参考答案(2023年9月)

  • 2026-04-01 15:13:09
C++1级考试真题参考答案(2023年9月)
第 1 题 
给定两个整数,表示一个日期的月和日。请按照"MM-DD"的格式输出日期,即如果月和日不到2位时,填补0使得满足2位。输入2个整数m,d(0 < m <= 12, 0 < d <= 31)。数据保证日期合法。按照题目要求输出日期
我的答案:
普通版:
#include<iostream>using namespace std;boolisTwoDigit(int date);intmain(){int month,day;	cin>>month>>day;if(isTwoDigit(month)) cout<<month<<'-';else cout<<'0'<<month<<'-';if(isTwoDigit(day)) cout<<day<<endl;else cout<<'0'<<day<<endl;return 0}boolisTwoDigit(int date){int digit=0;while(date)	{		digit++;		date/=10;	}if(digit==2return 1;else return 0;}
优化版:
#include<iostream>#include<iomanip>// 包含格式化输出库using namespace std;intmain(){    int m, d;    cin >> m >> d;    // setw(2) 设置输出宽度为2    // setfill('0') 设置填充字符为'0'    // 注意:setw只对紧随其后的一个输出项有效    cout << setfill('0') << setw(2) << m << "-" << setw(2) << d << endl;    return 0;}

第 2 题 

给定3个整数a、b、c,计算表达式(a+b)*(c-b)的值。

输入仅一行,包括三个整数a、b、c, 数与数之间以一个空格分开。 (-10,000 < a,b,c < 10,000)输出一行,即表达式的值

我的答案:

#include<iostream>using namespace std;intmain(){    int a, b, c;    cin >> a >> b >> c;    cout << (a + b) * (c - b);    return 0;}

第 3 题 

给出一名学生的语文和数学成绩,判断他是否恰好有一门课不及格(成绩小于60分)。输入一行,包含两个在0到100之间的整数,分别是该生的语文成绩和数学成绩。若该生恰好有一门课不及格,输出1;否则输出0。

我的答案:

#include<iostream>using namespace std;intmain(){int Chinese,math;	cin>>Chinese>>math;if((Chinese<60)+(math<60)==1) cout<<1<<endl;else cout<<0<<endl;return 0}

第 4 题 

如果一个数能够被7整除或者十进制表示中含有数字7,那么我们称这个数为幻数,比如17,21,73是幻数, 而6,59不是。 对于给定的N,求出1~N中所有幻数的和。输入一个整数N(1 < N < 10000)。 输出一个整数,表示1~N中所有幻数的和。 

我的答案:

#include<iostream>using namespace std;boolhasSeven(int n);intmain(){int N,sum=0;	cin>>N;for(int i=1;i<=N;i++)	{if(i%7==0 || hasSeven(i)) sum+=i;	}	cout<<sum<<endl;return 0}boolhasSeven(int n){int temp;while(n){		temp=n%10;if(temp==7return true;		n /=10;	}return false;}

第 5 题 问答题

对于给定的n,求比n小的质数中最大的一个。质数是指一个大于1的自然数,除了1和它自身外,不能被其他自然数整除的数。输入一个整数n。( 2 < n < 10000)输出一个整数,即题目要求的解。

我的答案:

#include<iostream>using namespace std;boolisPrime(int n);intmain(){    int n;    cin >> n;    for(int i = n - 1; i >= 2; i--) {        if (isPrime(i)) {            cout << i << endl;            break// 找到最大的一个后就结束循环        }    }    return 0}boolisPrime(int n){    if (n <= 1return false// 质数定义要求大于1    for (int i = 2; i * i <= n; i++) {        if (n % i == 0return false;    }    return true;}

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  1. CONNECT:[ UseTime:0.000598s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000868s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000318s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000266s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000669s ]
  6. SELECT * FROM `set` [ RunTime:0.000230s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000740s ]
  8. SELECT * FROM `article` WHERE `id` = 463824 LIMIT 1 [ RunTime:0.000573s ]
  9. UPDATE `article` SET `lasttime` = 1775356607 WHERE `id` = 463824 [ RunTime:0.000628s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000251s ]
  11. SELECT * FROM `article` WHERE `id` < 463824 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000524s ]
  12. SELECT * FROM `article` WHERE `id` > 463824 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000514s ]
  13. SELECT * FROM `article` WHERE `id` < 463824 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002967s ]
  14. SELECT * FROM `article` WHERE `id` < 463824 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001000s ]
  15. SELECT * FROM `article` WHERE `id` < 463824 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001411s ]
0.078710s