Question

我正在尝试使用3D结构阵列创建学校课程安排计划。

struct SPS
{
string Class;
string Teacher;
int noStudents;
};

struct SPS array[3][4][5];

概念视图：

我希望能够在特定位置输入数组，例如[1][2][2]。

这是我现有的代码，但它按预期执行。

cout << "Class:" << endl;
cin >> array[1][2][2].Class;
cout << "Teacher:" << endl;
cin >> array[1][2][2].Teacher;
cout << "Number of students:" << endl;
cin >> array[1][2][2].noStudents;

我正在尝试打印数组，但它没有在输出中显示：

for (int a = 0; a<3; a++)
{
    for (int b = 0; b<4; b++)
    {
        for (int c= 0; c<5; c++)
        {
            printf("%d\t", array[a][b][c]);
        }
        cout << "\n";
    }
    cout << "\n";
}

任何帮助都将不胜感激。

Answer 1

你不能像这样输出整个结构。 <section class="main-section" > <div class="p-grid-isotope" > <div class="p-item grid-sizer" ></div> </div> </section> <button type="submit" id="upload-img" class="following-button" style="color: white; margin-top: 30px; margin-left: 18%" onclick="uploadImage()"><span class="icons i1"><i class="fa fa-upload" aria-hidden="true"></i></span>Upload to account</button>不是魔法。编译器应该如何知道要使用哪种格式？

只需使用+---------+-----------------------+-----------------+ | Existing| Source of new element | Expected result | +---------+-----------------------+-----------------+ | [] | [1] | [1] | | [1,2] | [3,4] | [3, 4] | | [1,2,3] | [3,4] | [4] | +---------+-----------------------+-----------------+和printf()输出结构的每个成员：

cout

Answer 2

您应该只使用printf("%d\t", array[a][b][c])，而不是使用cout，您必须为数组中的每个位置获取Class，Teacher和noStudents。所以它应该像

 cout << array[i][j][k].Class << ' '
      << array[i][j][k].Teacher << ' '
      << array[i][j][k].noStudents << '\n';

Answer 3

我发现这个结构没有价值

struct SPS
{
  std::string Class;
  std::string Teacher;
  int         noStudents;
};

struct SPS array[3][4][5];

它是禁用的，被动的，并且没有提供有用的代码来帮助您完成其余的编程工作。

C ++可以轻松地使每个实例都能执行独特的功能。具体来说，您应该考虑在类中实现show（和fill）。这些函数使每个实例都能对应用程序有用...即“show（）”，“dump（）”，“saveToFile（）”，“restoreFromFile（）”等。

#include <iostream>
#include <sstream>
#include <string>


struct SPS
{
private:                  // for encapsulation
   std::string Class;
   std::string Teacher;
   int         noStudents;

public:
   // class instance 'show's itself
   std::string show()
      {
         std::stringstream ss;
         ss << Class << ' ' << Teacher << "     " << noStudents;
         return ss.str();
      }    

   // for this MCVE, a simple replacement for file i/o
   void fill(int a, int b, int c)
      {
         std::string s =
            std::to_string(a)
            + '.' + std::to_string(b)
            + '.' + std::to_string(c);
         Class      = "\n  Class " + s;
         Teacher    = "  Teacher " + s;
         noStudents = c;
      }
    // add saveToFile(), restoreFromFile(), dump()
};

struct SPS array[3][4][5];

注意 - 不需要单字段获取者或设置者......这些都浪费了程序员的时间。

完成此MCVE，我提供：

class T601_t  // a simple test 
{
public:

   T601_t() = default;
   ~T601_t() = default;

   int exec(int , char**  )
      {
         fill3dArray();

         show3dArray();

         return 0;
      }

private: // methods

   // specific to this MCVE, a quick and dirty fill
   void fill3dArray()
      {
         for (int a = 0; a<3; a++)
         {
            for (int b = 0; b<4; b++)
            {
               for (int c = 0; c < 5; c++)
               {
                  array[a][b][c].fill(a, b, c);
                  // record -----^^^^ self filling
               }
            }
         }
      }
      // your code would enter the a, b, and c from user prompts? 
      // or perhaps a file read?

   // specific to this MCVE, invoke the show method of 
   //                        each element of the array
   void show3dArray()
      {
         for (int a = 0; a<3; a++)
         {
            for (int b = 0; b<4; b++)
            {
               for (int c= 0; c<5; c++)
               {
                  std::cout << array[a][b][c].show() << '\n';
                  // record ------------------^^^^ self showing
                  // it is trivial for this cout to prefix the show
                  // with a triple for readability or diagnostics
               }
               std::cout << "\n";
            }
            std::cout << "\n";
         }
      }

}; // class T601_t


int main(int argc, char* argv[])
{
   T601_t  t601;
   return  t601.exec(argc, argv);
}

显示三维结构数组

3 个答案: