Question

我按照升序排列了所有考试，测验，作业和期末考试的分数。但是我不知道如何在每次考试，测验，作业和期末考试中根据学生的分数以升序显示所有学生的姓名。

下面是我的代码，以升序对测试，测验，作业和期末考试的每个分数进行排序。如何更改代码，使其显示学生姓名，而不是每次考试，测验，作业和期末考试的分数？

请帮忙。预先谢谢你。

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

//global constant
const int NUM_STUDENTS=5;//row
const int NUM_SCORES=4;//col
string name[5]={"Hani","Haziq","Aiman","Farah","Sabrina"};
string mark[4]={"test","quiz","assignment","final exam"};

//Function prototypes
void ascenDescen(double [ ][NUM_SCORES],int);

int main ( )
{
    cout<<"This program will help you keep track of your academic record!"<<endl;

    double scores[NUM_STUDENTS][NUM_SCORES]=
     {{9.0,2.7,16.0,78.0},
      {7.4,2.7,19.0,88.0},
      {8.9,3.5,17.5,93.7},
      {10.0,3.0,19.5,64.8},
      {6.3,3.0,16.0,74.2}};

    //function call
    ascenDescen(scores,NUM_STUDENTS);

    cout<<endl;
    cout<<"THANK YOU."<<endl;

    return 0;
}

void ascenDescen (double table[][NUM_SCORES],int rows)
{
    //for ascending 
    cout<<"Press ENTER to sort the mark for all tests, quizzes, assignments and final exam in ASCENDING order : \n\n"; 
    char ch;
    ch=cin.get();

    double ascen;
    for(int col=0;col<NUM_SCORES;col++)
    {
        for(int row=0;row<NUM_STUDENTS;row++)
        {
             for(int j=row+1;j<NUM_STUDENTS;++j)
             {
                if(table[row][col]>table[j][col])
                {
                    ascen=table[row][col];
                    table[row][col]=table[j][col];
                    table[j][col]=ascen;
                }
             }
        }

        cout<<mark[col]<<" mark in ASCENDING order : \n";
        for(int row=0;row<NUM_STUDENTS;row++)
        {
            cout<<"  ";
            cout<<table[row][col];
            cout<<endl;
        }
    }
     cout<<"________________________"<<endl;

}

Answer 1

经验法则：如果需要并行数组，则vector应该为struct。

让我们尝试使用Student结构为数据建模：

struct Student
{
  std::string name;
  std::vector<int> marks;
};

到目前为止，每个Student 都有一个名称，并且有一些标记。具有关系表示组成。 is-a 关系表示继承。

让我们为标记添加一种排序方法。如果标记是排序的，学生将更容易按标记排序。

struct Student
{
  //...
  void sort_marks()
  {
    std::sort(marks.begin(), marks.end()); // Assume default of `std::less<int>`
  }
};

要执行默认设置以外的其他订购，我们需要定义一个自定义订购功能：

bool Order_By_Marks(const Student& a, const Student& b)
{
    bool a_is_less_than_b = true;
    unsigned int quantity_of_marks = a.marks.size();
    if (b.marks.size() < quantity_of_marks)
    {
       quantity_of_marks = b.marks.size();
    }
    for (unsigned int i = 0; i < quantity_of_marks; ++i)
    {
       if (a.marks[i] > b.marks[i])
       {
         a_is_less_than_b = false;
         break;
       }
    }
    return a_is_less_than_b;
}

要用标记对Student的数据库进行排序：

std::vector<Student> database;
// ... input students ...
for (i = 0; i < database.size(); ++i)
{
    database[i].sort_marks();
}
std::sort(database.begin(), database.end(), Order_By_Marks);

您需要使用调试器遍历代码，以验证学生分数的顺序以及按分数对学生的顺序。

Answer 2

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

//global constant
const int NUM_STUDENTS=5;//row
const int NUM_SCORES=4;//col
string name[5]={"Hani","Haziq","Aiman","Farah","Sabrina"};
string mark[4]={"test","quiz","assignment","final exam"};

struct student {

};

//Function prototypes
void ascenDescen(double [ ][NUM_SCORES],int);

int main ( )
{
    cout<<"This program will help you keep track of your academic record!"<<endl;

    double scores[NUM_STUDENTS][NUM_SCORES]=
     {{9.0,2.7,16.0,78.0},
      {7.4,2.7,19.0,88.0},
      {8.9,3.5,17.5,93.7},
      {10.0,3.0,19.5,64.8},
      {6.3,3.0,16.0,74.2}};

    //function call
    ascenDescen(scores,NUM_STUDENTS);

    cout<<endl;
    cout<<"THANK YOU."<<endl;

    return 0;
}

void ascenDescen (double table[][NUM_SCORES],int rows)
{
    //for ascending 
    cout<<"Press ENTER to sort the mark for all tests, quizzes, assignments and final exam in ASCENDING order : \n\n"; 
    cin.get();

    double ascen;
    string temp1[5] = name;
    string temp2;
    for(int col=0;col<NUM_SCORES;col++)
    {
        for(int row=0;row<NUM_STUDENTS;row++)
        {
             for(int j=row+1;j<NUM_STUDENTS;++j)
             {
                if(table[row][col]>table[j][col])
                {
                    ascen=table[row][col];
                    temp2 = temp1[row];
                    table[row][col]=table[j][col];
                    temp1[row] = temp1[j]; 
                    table[j][col]=ascen;
                    temp1[j] = temp2;

                }
             }
        }

        cout<<mark[col]<<" mark in ASCENDING order : \n";
        for(int row=0;row<NUM_STUDENTS;row++)
        {
            cout<<"  ";
            cout << temp1[row] << " " <<table[row][col];
            cout<<endl;
        }
        for(int i = 0; i < NUM_STUDENTS; i++) 
        {
        temp1[i] = name[i];
        }
    }
     cout<<"________________________"<<endl;

}

如何按照标记升序打印学生姓名

2 个答案: