Question

我不知道我的代码有什么问题，但它会出现此错误。

main.cpp（12）：错误C2061：语法错误：标识符'vec1'。

在构造函数中声明这样的向量向量没有问题，但我似乎无法将其作为类成员。

#include <iostream>
#include <string>
#include <vector>

using namespace std;

class vecList
{
private:
    int row, column, vec1, vec2, part;
    vector< vector <int> > vEC(vec1,vector<int>(vec2));

public:
    vecList(int vRow, int vColumn, int vPart)
    {
        cin >> vRow;
        cin >> vColumn;
        row = vRow;
        column = vColumn;
        vector< vector <int> > vEC(vColumn, vector<int>(vRow));
        for(int i = 0; i < vColumn; i++)
        {
            cout << endl  << "|";
            for(int j = 0; j < vRow; j++)
            {
                vEC[i][j] = 14;
                cout << vEC[i][j] << "|";
            }
        }    
    }

    void getValue()
    {
        int a, b;
        a = column;
        b = row;
        cout << a << b;
    }
};
int main()
{
vecList a(2,4,6);
a.getValue();
a.getVect();
}

Answer 1

在你的班级声明中：

vector< vector <int> > vEC(vec1,vector<int>(vec2));

不是数据成员的有效声明。一，因为它是无效的语法，两个，因为vec1和vec2的值在构造成员时是未知的。

尝试更像这样的东西：

class vecList
{
private:
    int row, column, part;
    vector< vector<int> > vEC;

public:
    vecList(int vRow, int vColumn, int vPart)
    {
        /* these values are provided by the caller, so you shouldn't
        be reading them from std::cin here.  That is the caller's
        responsibility to do instead...
        cin >> vRow;
        cin >> vColumn;
        */

        row = vRow;
        column = vColumn;
        part = vPart;

        vEC.resize(vColumn);
        for(int i = 0; i < vColumn; i++)
        {
            vEC[i] = vector<int>(vRow);
            cout << endl  << "|";
            for(int j = 0; j < vRow; j++)
            {
                vEC[i][j] = 14;
                cout << vEC[i][j] << "|";
            }
        }    
    }

    ...
};

可以简化为：

class vecList
{
private:
    int row, column, part;
    vector< vector <int> > vEC;

public:
    vecList(int vRow, int vColumn, int vPart)
        : row(vRow), column(vColumn), part(vPart), vEC(vColumn, vector<int>(vRow, 14))
    {
        for(int i = 0; i < vColumn; i++)
        {
            cout << endl  << "|";
            for(int j = 0; j < vRow; j++)
            {
                cout << vEC[i][j] << "|";
            }
        }    
    }

    ...
};

Answer 2

首先，你没有主 - 因此，你的程序无法运行。其次，你需要在vEC的decliration中定义vec1变量的类型。

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

class vecList

{
private:
    int row, column, vec2, part;
    vector< vector <int> > vEC(int(vec1), vector<int>(vec2));

public:
    vecList(int vRow, int vColumn, int vPart)
    {
        cin >> vRow;
        cin >> vColumn;
        row = vRow;
        column = vColumn;
        vector< vector <int> > vEC(vColumn, vector<int>(vRow));
        for (int i = 0; i<vColumn; i++)
        {
            cout << endl << "|";
            for (int j = 0; j<vRow; j++)
            {
                vEC[i][j] = 14;
                cout << vEC[i][j] << "|";
            }
        }
    }
    void getValue()    {
        int a, b;
        a = column;
        b = row;
        cout << a << b;
    }
};

int main()
{
/*...Your code here...*/
}

Answer 3

最好的想法是让构造函数初始化向量。

#include <iostream>
#include <string>
#include <vector>

using namespace std;

class vecList
{
    public:
        vecList(int vRow, int vColumn, int vPart)
            :
            vec1(vColumn),
            vec2(vRow),
            part(vPart),
            vEC(vec1, vector<int>(vec2))
        {
            for(int i = 0; i < vColumn; i++)
            {
                cout << endl << "|";

                for(int j = 0; j < vRow; j++)
                {
                    vEC[i][j] = 14;
                    cout << vEC[i][j] << "|";
                }

                cout << endl;
            }
        }

        void getValue()
        {
            int a, b;
            a = column;
            b = row;
            cout << a << b;
        }

    private:
        int row, column, vec1, vec2, part;
        vector< vector <int> > vEC;

};

int main()
{
    vecList veclist(3, 4, 2);
    veclist.getValue();
    return 0;
}

main.cpp（12）：错误C2061：语法错误：标识符'vec1'

3 个答案: