三个小问题,本人0基础真的不会写,有偿求解答

(使用C/C++语言解答,一个程序每个子功能后都用//备注一下是发挥什么功能,谢谢 ! )

问题1

img

问题2

img

问题3

img

1:

#include <iostream>
using namespace std;
//type=0表示摄氏转华式
double calc(double value, int type = 0)
{
    double f=0, c=0;
    if (type == 0)
    {
        f = (value * 9 / 5) + 32;
        return f;
    }
    else
    {
        c = (value - 32) * 5 / 9;
        return c;
    }
}


int main()
{
    double v, t;
    cin >> v;
    printf("  摄氏温度:%.15lf\n",v);
    t = calc(v, 0);
    printf("=>华氏温度:%.15lf\n", t);
    t = calc(t, 1);
    printf("=>摄氏温度:%.15lf\n", t);
    return 0;
}

2:

#include <iostream>
using namespace std;
template<typename T>
void pow(T value, T& pingfang, T& lifang)
{
    pingfang = value * value;
    lifang = value * value * value;
}


int main()
{
    double n;
    double pf, lf;
    cout << "请输入1个输,按回车结束:";
    cin >> n;
    pow(n, pf, lf);
    cout << n << "的平方:" << pf << endl;
    cout << n << "的立方:" << lf << endl;
    return 0;
}

3:(数据直接录入了,输入需要查询的科目和学号即可输出,另外,再差某个科目的最低和最高成绩的时候,只保留了一个学生的信息)

img

#define _CRT_SECURE_NO_WARNINGS 1
#include <iostream>
#include <string>
using namespace std;
//定义最大课程数
#define MAXKC 4
class Student
{
private:
    string mId;
    string mName;
    string mSex;
public:
    Student() { mId = ""; mName = ""; mSex = ""; }
    void setId(string id) { mId = id; }
    string getId() { return mId; }
    void setName(string n) { mName = n; }
    string getName() { return mName; }
    void setSex(string s) { mSex = s; }
    string getSex() { return mSex; }
};

class Grade
{
private:
    string mName;
    int mScore;
public:
    Grade() { mName = ""; mScore = 0; }
    void setName(string n) { mName = n; }
    string getName() { return mName; }
    void setScore(int n) { mScore = n; }
    int getScore() { return mScore; }
};


class StudentGrade
{
public:
    Student mStu;
    Grade mGrade[MAXKC];
    
    void show()
    {
        cout << "姓名:" << mStu.getName() << endl;
        cout << "性别:" << mStu.getSex() << endl;
        cout << "学号:" << mStu.getId() << endl;
        for (int j = 0; j < MAXKC; j++)
        {
            if (j < MAXKC - 1)
                cout << mGrade[j].getName() << " " << mGrade[j].getScore() << " ";
            else
                cout << mGrade[j].getName() << " " << mGrade[j].getScore() << endl;
        }
    }
    /*
public:
    StudentGrade() { mNmb = 0; }
    void SetStu(Student s) { mStu = s; }
    Student getStu() { return mStu; }*/
    
};



int main()
{
    StudentGrade arr[5];
    //添加学生信息
    arr[0].mStu.setName("Zhang");
    arr[0].mStu.setSex("男");
    arr[0].mStu.setId("001");
    arr[0].mGrade[0].setName("A");
    arr[0].mGrade[0].setScore(65);
    arr[0].mGrade[1].setName("B");
    arr[0].mGrade[1].setScore(70);
    arr[0].mGrade[2].setName("C");
    arr[0].mGrade[2].setScore(53);
    arr[0].mGrade[3].setName("D");
    arr[0].mGrade[3].setScore(80);
    

    arr[1].mStu.setName("Cheng");
    arr[1].mStu.setSex("女");
    arr[1].mStu.setId("002");
    arr[1].mGrade[0].setName("A");
    arr[1].mGrade[0].setScore(75);
    arr[1].mGrade[1].setName("B");
    arr[1].mGrade[1].setScore(75);
    arr[1].mGrade[2].setName("C");
    arr[1].mGrade[2].setScore(85);
    arr[1].mGrade[3].setName("D");
    arr[1].mGrade[3].setScore(78);

    arr[2].mStu.setName("Li");
    arr[2].mStu.setSex("女");
    arr[2].mStu.setId("003");
    arr[2].mGrade[0].setName("A");
    arr[2].mGrade[0].setScore(68);
    arr[2].mGrade[1].setName("B");
    arr[2].mGrade[1].setScore(45);
    arr[2].mGrade[2].setName("C");
    arr[2].mGrade[2].setScore(95);
    arr[2].mGrade[3].setName("D");
    arr[2].mGrade[3].setScore(72);

    arr[3].mStu.setName("Cha");
    arr[3].mStu.setSex("男");
    arr[3].mStu.setId("004");
    arr[3].mGrade[0].setName("A");
    arr[3].mGrade[0].setScore(67);
    arr[3].mGrade[1].setName("B");
    arr[3].mGrade[1].setScore(70);
    arr[3].mGrade[2].setName("C");
    arr[3].mGrade[2].setScore(64);
    arr[3].mGrade[3].setName("D");
    arr[3].mGrade[3].setScore(62);

    arr[4].mStu.setName("Xun");
    arr[4].mStu.setSex("男");
    arr[4].mStu.setId("005");
    arr[4].mGrade[0].setName("A");
    arr[4].mGrade[0].setScore(65);
    arr[4].mGrade[1].setName("B");
    arr[4].mGrade[1].setScore(90);
    arr[4].mGrade[2].setName("C");
    arr[4].mGrade[2].setScore(78);
    arr[4].mGrade[3].setName("D");
    arr[4].mGrade[3].setScore(85);

    //输出制定科目最高分和最低分的学生信息
    string skm;
    cout << "请输入科目名称,查询该科目的最高和最低的学生课程成绩信息:";
    cin >> skm;
    int max=0, min=0, maxindex = 0, minindex = 0;
    for (int i = 0; i < 5; i++)
    {
        for (int j = 0; j < MAXKC; j++)
        {
            if (arr[i].mGrade[j].getName().compare(skm) == 0)
            {
                if (max == 0 || arr[i].mGrade[j].getScore() > max)
                {
                    max = arr[i].mGrade[j].getScore();
                    maxindex = i;
                }
                if (min == 0 || arr[i].mGrade[j].getScore() < min)
                {
                    min = arr[i].mGrade[j].getScore();
                    minindex = i;
                }
            }
            
        }
    }
    //输出
    cout << skm << "科目分数最高的:";
    arr[maxindex].show();

    cout << skm << "科目分数最低的:";
    arr[minindex].show();

    //
    string id;
    cout << "请输入学生学号,以查询该学生科目分数的最高和最低分:";
    cin >> id;
    for (int i = 0; i < 5; i++)
    {
        if (arr[i].mStu.getId().compare(id) == 0)
        {
            max = arr[i].mGrade[0].getScore();
            min = arr[i].mGrade[0].getScore();
            maxindex = 0;
            minindex = 0;
            for (int j = 1; j < MAXKC; j++)
            {
                if (arr[i].mGrade[j].getScore() > max)
                {
                    max = arr[i].mGrade[j].getScore();
                    maxindex = j;
                }
                if (arr[i].mGrade[j].getScore() < min)
                {
                    min = arr[i].mGrade[j].getScore();
                    minindex = j;
                }
            }
            //输出
            //cout << "姓名:" << arr[i].mStu.getName() << endl;
            //cout << "性别:" << arr[i].mStu.getSex() << endl;
            //cout << "学号:" << arr[i].mStu.getId() << endl;
            cout << "最高成绩:" << arr[i].mGrade[maxindex].getName() << " " << arr[i].mGrade[maxindex].getScore() << endl;
            cout << "最低成绩:" << arr[i].mGrade[minindex].getName() << " " << arr[i].mGrade[minindex].getScore() << endl;
            break;
        }
    }

    return 0;
}

分享一个源码,下载直接使用

源码

如果不懂,请看这篇教程


如果有用望采纳