Question

我的问题是添加元素。如果我试图再次添加它只是替换最后一个添加位置。在添加时，它应该移动到下一个插槽/索引。

例如

   0  1  2  3  4  5
0| a  b  c  d  e  f
1| g  h  i  j  k  l
2| 

Add element:m

 0  1  2  3  4  5
0| a  b  c  d  e  f
1| g  h  i  j  k  l
2| m

添加元素：n

0  1  2  3  4  5
0| a  b  c  d  e  f
1| g  h  i  j  k  l
2| m  n

这是我的代码：

  #include<iostream>
    #include<string>

    std::string myarray[3][6] = {{"a","b","c","d","e","f"},
                                {"g","h","i","j","k","l"},
                                {" "," "," "," "," "," "}}; 


    void display();

    using namespace std;

    int main(){

    while(true){

        display();

        char add;
        int rows = 2;
        int cols = 6;

        cout<<"==========================================" <<endl;
        cout<<"Add element: ";
        cin>>add;

        int size = rows*cols;
        myarray[0][size] = add;

        cout<<"Adding Successful!" <<endl;

        size=size+1;
    }

    }

    //display
    void display(){

        cout<<endl;
        for(int z = 0; z<6; z++){
            cout<<"  "<<z;
        }
        cout<<endl;

        for(int x = 0; x<3; x++){
        cout<<x <<"|";
            for(int y = 0; y<6; y++){
                cout<<" " <<myarray[x][y] <<" "; 
            }
        cout<<endl;
        }
    }

Answer 1

始终为元素myarray[0][size]分配一个新值，在每次迭代中计算一个新的int size = rows*cols;（size = 12）。并且您正在从ist限制中访问Array

如果没有考虑任何其他问题，可能会修复此问题：

int col=0;
while (col < 6) {
    display();

    char add;

    cout<<"==========================================" <<endl;
    cout<<"Add element: ";
    cin>>add;

    myarray[2][col] = add;

    cout<<"Adding Successful!" <<endl;

    ++col;
}

Answer 2

问题在于他的代码部分

int rows = 2;

    int cols = 6;

cout<<"==========================================" <<endl;
cout<<"Add element: ";
cin>>add;

int size = rows*cols;
myarray[0][size] = add

你需要像++行或++ cols这样的东西并调用

myarray[rows][cols] = add

静态2d数组，添加元素

2 个答案: