我如何称呼数组中的值并更改数组中的值

How do I call the value in array and change the value in array?

本文关键字：数组      更新时间：2023-10-16
class DataStorage{
                        // 0 1 2 3 4        5 6 7 8
string Data[20][4]={{"Wee","50","1","First"},{"Wee","22","2","First"},
                        // 9 10 11 12       13 14 15 16
                    {"Jason","26","3","First"},{"Krappa","12","4","First"},
                        // 17 18 19 20      21 22 23 24
                    {" "," ","5","First"},{" "," ","6","Economy"},
                        //25 26 27 28       29 30 31 32
                    {"Kappa","15","7","Economy"},{"Eraser","17","8","Economy"},
                        //33 34 35 36       37 38 39 40
                    {" "," ","9","Economy"},{"Morty"," ","10","Economy"},
                        //41 42 43 44       45 46 47 48
                    {"Rick"," ","11","Economy"},{"Amanda","10","12","Economy"},
                        //49 50 51 52       53 54 55 56
                    {"Lee","","13","Economy"},{"MingLee"," ","14","Economy"},
                        //57 58 59 60       61 62 63 64
                    {"Beauty"," ","15","Economy"},{"S4head"," ","16","Economy"},
                        //65 66 67 68       69 70 71 72
                    {"Ivan"," ","17","Economy"},{"Dex"," ","18","Economy"},
                        //73 74 75 76       77 78 79 80
                    {"Chua"," ","19","Economy"},{"Haha"," ","20","Economy"},};
};
int main(){
}

如何在数组中调用值并更改数组中的值？我是否需要做出一些函数才能从输入中获取值并将其传递到类中的变量并将其设置为我的数组？

我不确定当您说How do I call the value in array and change the value in array?时您在问什么，但我想您问您如何更改数组元素的价值。

要修改数组元素，您将数组索引分配给您要更改数组元素的内容；但是，请记住，C 数组是0个索引数组的含义，含义在开始计数其元素时。 

#include <iostream>
int array[10] = {1, 5, 33, 7, -23, 2, 8, 54, 19, 2};
int main() {
  std::cout << array[5] << std::endl;
  array[5] = 100; // Set the value of the element at index 5 to 100
  std::cout << array[5] << std::endl;
  return 0;
}

如果要将Data作为DataStorage的类成员，则必须在成员初始化列表中初始化它。我还强烈建议将抽象用于裸阵列，例如std::array。这允许使用at()函数使用边界检查的访问。然后，您可以访问Data并更改其内容。

#include <array>
#include <iostream>
#include <string>
class DataStorage
{
public:
    std::array<std::array<std::string,4>,20> Data;
    DataStorage() : Data({{
                {{"Wee","50","1","First"}},
                {{"Wee","22","2","First"}},
                {{"Jason","26","3","First"}},
                {{"Krappa","12","4","First"}},
                {{" "," ","5","First"}},
                {{" "," ","6","Economy"}},
                {{"Kappa","15","7","Economy"}},
                {{"Eraser","17","8","Economy"}},
                {{" "," ","9","Economy"}},
                {{"Morty"," ","10","Economy"}},
                {{"Rick"," ","11","Economy"}},
                {{"Amanda","10","12","Economy"}},
                {{"Lee","","13","Economy"}},
                {{"MingLee"," ","14","Economy"}},
                {{"Beauty"," ","15","Economy"}},
                {{"S4head"," ","16","Economy"}},
                {{"Ivan"," ","17","Economy"}},
                {{"Dex"," ","18","Economy"}},
                {{"Chua"," ","19","Economy"}},
                {{"Haha"," ","20","Economy"}}
            }}) {}
};
int main()
{
    DataStorage d;
    std::cout << d.Data.at(10).at(2) << 'n'; // prints 11
    d.Data.at(10).at(2) = "1729";
    std::cout << d.Data.at(10).at(2) << 'n'; // prints 1729
}
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