码蹄集新手村100题答案

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码蹄集是今年新上线的一个OJ平台，内含了100道基础题和一些百度之星的题目。由于很多题目有原创性，搜不到相关解答，因此我花了两天特将100道题目刷了一遍，目前位居榜二。
码蹄集传送门：https://www.matiji.net/exam/ojquestionlist

前言

所有题目均能AC，不一定是最佳方法，如有其它方法，可在评论区留言讨论。

1、程序设计入门

#include <iostream>

using namespace std;

int main( )

    cout << "This is my first program!" << endl;
    cout << "Coding is fun!" << endl;
    return 0;

2、输入和输出整型数据

#include <iostream>

using namespace std;

int main( )

    int a;
    cin >> a;
    cout << "You entered:"<< a;
    return 0;

3、输入和输出实型数据

#include <iostream>
#include <iomanip>
using namespace std;

int main()

    float a;
    double b;
    cin >> a;
    cin >> b;
    cout << "You entered:" << setiosflags(ios::fixed) << setprecision(2) << a << " and " << setiosflags(ios::fixed) << setprecision(3) << b;
    return 0;

4、输入和输出字符型数据

#include <iostream>
using namespace std;

int main()

    int a, b;
    scanf_s("%d,%d", &a,&b);
    cout << a << "+" << b << "=" << a+b << endl;
    cout << a << "-" << b << "=" << a-b;
    
    return 0;

5、整数运算

#include <iostream>
using namespace std;

int main()

    int a, b;
    scanf("%d,%d", &a,&b);
    cout << a << "+" << b << "=" << a+b << endl;
    cout << a << "-" << b << "=" << a-b;
    
    return 0;

6、实型数运算

#include <iostream>
#include <iomanip>
using namespace std;

int main()

    double a, b;
    cin >> a >> b;
    cout << setiosflags(ios::fixed) << setprecision(6) << a << "*" << setiosflags(ios::fixed) << setprecision(6) << b << "=" << setiosflags(ios::fixed) << setprecision(6) << a * b << endl;
    cout << setiosflags(ios::fixed) << setprecision(6) << a << "/" << setiosflags(ios::fixed) << setprecision(6) << b << "=" << setiosflags(ios::fixed) << setprecision(6) << a / b;
    
    return 0;

7、求余

#include <iostream>

using namespace std;

int main( )

    int a,b,c,d;
    cin >> a >> b >> c >> d;
    cout << a << "%" << b << "=" << a%b << endl;
    cout << c << "%" << d << "=" << c%d;
    return 0;

8、各种类型长

#include <iostream>

using namespace std;

int main()

    cout << "Size of int: " << sizeof(int) << " bytes" << endl;
    cout << "Size of float: " << sizeof(float) << " bytes" << endl;
    cout << "Size of double: " << sizeof(double) << " bytes" << endl;
    cout << "Size of char: " << sizeof(char) << " byte";

    return 0;

9 、关键字long

#include <iostream>

using namespace std;

int main()

    cout << "Size of int = " << sizeof(int) << " bytes" << endl;
    cout << "Size of long int = " << sizeof(long int) << " bytes" << endl;
    cout << "Size of long long int = " << sizeof(long long int) << " bytes" << endl;
    cout << "Size of double = " << sizeof(double) << " bytes" << endl;
    cout << "Size of long double = " << sizeof(long double) << " bytes" ;

    return 0;

10、交换

#include <iostream>

using namespace std;

int main( )

    int a,b;
    cin >> a >> b;
    cout << b << " " << a;
    return 0;

11、求圆面积和周长

#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;
#define pi 3.1415926

int main()

    double r;            
    cin >> r;
    cout << "Area=" << setiosflags(ios::fixed) << setprecision(6) << pi * r * r << endl;
    cout << "Circumference=" << setiosflags(ios::fixed) << setprecision(6) << 2 * pi * r;
    return 0;

12、求矩形面积和周长

#include <iostream>

using namespace std;

int main()

    double a, b;
    cin >> a >> b;
    printf("Area=%.6f\\n", a * b);
    printf("Perimeter=%.6f", a * 2 + b * 2);
    return 0;

13、椭圆计算

#include <iostream>
#include <iomanip>

using namespace std;
# define pi 3.1415926
int main( )

    double a,b;
    cin >> a >> b;
    cout << "Area = " << setiosflags(ios::fixed) << setprecision(6) << pi * a * b;
    
    return 0;

14、圆锥的表面积

#include <iostream>
#include <math.h>
#include <iomanip>
using namespace std;

# define pi 3.1415926
int main()

    double r, h, area;
    cin >> r >> h;
    area = pi * r * (r + sqrt(pow(r, 2) + pow(h, 2)));
    cout << "Surface area=" << setiosflags(ios::fixed) << setprecision(2) << area;
    return 0;

15、三角形面积

#include <iostream>
#include<iomanip>
using namespace std;

int main( )

    float a,b;
    cin >> a >> b;
    cout << "Area=" << setiosflags(ios::fixed) << setprecision(2) << 0.5 * a * b;
    return 0;

16、平方根和对数值

#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;

int main()

    double a;
    cin >> a;
    cout << setiosflags(ios::fixed) << setprecision(2) << sqrt(a) << " " << setiosflags(ios::fixed) << setprecision(2) << log(a) << " " << setiosflags(ios::fixed) << setprecision(2) << log10(a);
    return 0;

17、坐标的转换

#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
#define pi 3.1415926

int main()

    float x, y;
    cin >> x >> y;
    cout << setiosflags(ios::fixed) << setprecision(1) << sqrt(pow(x, 2) + pow(y, 2)) << " " << setiosflags(ios::fixed) << setprecision(1) << atan(y/x)*180/pi;
    return 0;

18、分期付款

#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;

int main( )

    double p ,r , n;
    cin >> p >> r >> n;
    r = r/(12*100);
    double rate = p * r * pow(1+r,n)/(pow(1+r,n)-1);
    cout << setiosflags(ios::fixed) << setprecision(1) << rate;
    return 0;

19、极坐标到笛卡尔坐标的转换

#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;
#define pi 3.1415926
int main()

    double r, theta;
    cin >> r >> theta;
    double x = r * cos(theta * pi / 180);
    double y = r * sin(theta * pi / 180);
    cout << setiosflags(ios::fixed) << setprecision(2) << x << "," << setiosflags(ios::fixed) << setprecision(2) << y;
    return 0;

20、公里转换成米

#include <iostream>
#include <iomanip>
using namespace std;

int main( )

    double a;
    cin >> a;
    cout << setiosflags(ios::fixed) << setprecision(2) << a << "公里="<< setiosflags(ios::fixed) << setprecision(2) << a*1000 << "米";
    return 0;

21、和10相比

#include <iostream>

using namespace std;

int main( )

    int a;
    cin >> a;
    if (a<10)
    
        cout << a << "小于10";
    
    else if (a == 10)
    
        cout << a << "等于10";
    
    else
    
        cout << a << "大于10";
    
    return 0;

22、成绩评语

#include <iostream>
using namespace std;

int main()

    char a;
    cin >> a;
    if (a == 'A')
    
        cout << "Excellent";
    
    else if (a == 'B')
    
        cout << "Well done";
    
    else if (a == 'C')
    
        cout << "You passed";
    
    else if (a == 'D')
    
        cout << "Better luck next time";
    
    else
    
        cout << "Invalid grade";
    

    return 0;

23、元音

#include <iostream>

using namespace std;

int main( )

    char a;
    cin >> a;
    if (a == 'A' or a == 'E' or a =='I' or a == 'O' or a == 'U') cout << "Y";
    else cout << "N";
    return 0;

24、大小写的转换

#include <iostream>

using namespace std;

int main()

    char a;
    cin >> a;
    if (a >= 'a' & a <= 'z')
    
        cout << char(a - 32);
    
    else if (a >= 'A' & a <= 'Z')
    
        cout << char(a + 32);
    
    else
    
        cout << a;
    
    return 0;

25、最小值

#include <iostream>

using namespace std;

int main( )

    int a,b;
    cin >> a >> b;
    if (a > b) cout << b;
    else cout << a;
    return 0;

26、最大值

#include <iostream>

using namespace std;

int main( )

    int a,b;
    cin >> a >> b;
    if (a > b) cout << a;
    else cout << b;
    return 0;

27、中庸之道

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int main()

    int a, b, c;
    cin >> a >> b >> c;
    vector<int> v;
    v.push_back(a);
    v.push_back(b);
    v.push_back(c);
    sort(v.begin(), v.end());
    cout << v[1算法竞赛入门码蹄集新手村600题(MT1351-1400）


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