Question

我正在尝试创建一个学生结构，然后在该结构内部有一系列成绩（或标记），基于用户输入的标记。

然后我尝试创建Student结构的动态数组。

我想与这些指针互动，即输入学生信息和成绩然后cout他们然而我不认为我正在这样做。这是我的代码开头的一部分。我的主要问题是创建一个标记数组，我无法在我的教科书中找到如何声明它。

#include <string.h>
#include <iostream>
#include <sstream>
using namespace std;


struct Student
{
  string name;
  int id;
  int* mark;
  ~Student()
 {
   delete [] mark;
   mark = NULL;
 };
};

void initStudent(Student* ptr, int markNum, int studentNum );   // function prototype for initialization
void sayStudent(Student* ptr, int markNum, int studentNum);     // function prototype for printing

//*********************** Main Function ************************//
int main ()
{
  int marks, studentNum;
  Student stu;           // instantiating an STUDENT object
  Student*  stuPtr = &stu;  // defining a pointer for the object
  cout << "How many marks are there? ";
  cin >>  marks;
  cout << "How many students are there?";
  cin >> studentNum;
  Student* mark = new int[marks];
  Student* students = new Student[studentNum];

  initStudent(students,marks,studentNum);      // initializing the object
  sayStudent(students,marks,studentNum);       // printing the object
  delete [] students;

return 0;

} // end main

//-----------------Start of functions----------------------------//

void initStudent(Student* ptr, int markNum, int studentNum)
{
    for (int i = 0; i < studentNum; i++)
    {

       cout << "Enter Student " << i+1 << " Name :";
       cin >> ptr[i].name;
       cout << "Enter Student ID Number :";
       cin >> ptr[i].id;
       for (int j = 0; j < markNum; j++)
        {
       cout << "Please enter a mark :";
       cin >> ptr[i].mark[j];
        }
     }
  }

Answer 1

您需要在每个postgres元素中分配marks数组。

Student

您也可以在Student* students = new Student[studentNum]; for (int i = 0; i < studentNum; i++) { students[i].mark = new int[marks]; }。

中执行此操作

initStudent

创建结构元素的动态数组，然后创建结构的动态数组。 C ++

1 个答案: