Question

我是C ++的新手。我写了一个给出一组状态的程序，问题是当我尝试在主程序中打印状态时，因为我的Nodo指针为[5]。我在同一函数中打印状态，并生成这些状态，问题是当我在主程序中调用该函数时，当我尝试打印某些状态时，会打印出类似912222558的数字。请帮帮我。

#include <iostream>
using namespace std;

class State {
public:
    int dsc[3];

    State()
    {
        dsc[0] = 3;
        dsc[1] = 3;
        dsc[2] = 1;
    }

    void printstate()
    {
        for (int i = 0; i < 3; i++) {
            cout << " " << dsc[i] << " ";
        }
        cout << endl;
    }

    bool checkObjetivo()
    {
        if (dsc[0] == 0 && dsc[1] == 0 && dsc[2] == 0) {
            return true;
        }
        else {
            return false;
        }
    }

    bool validState()
    {
        if ((dsc[0] >= 0 && dsc[0] <= 3) && (dsc[1] >= 0 && dsc[1] <= 3) && (dsc[2] >= 0 && dsc[2] <= 1) && (dsc[1] <= dsc[0])) {
            return true;
        }
        else {
            return false;
        }
    }
};

class Nodo {
public:
    State state;
    Nodo* father;
    Nodo* child[5];
    int level;
    bool solution;

    Nodo()
    {
        father = NULL;
        for (int i = 0; i < 5; i++) {
            child[i] = NULL;
        }
        level = 0;
        solution = false;
    }

    Nodo childGeneration()
    {
        Nodo nuevoNodo;

        if (state.validState()) {
            if (state.checkObjetivo()) {
                for (int i = 0; i < 3; i++) {
                    nuevoNodo.state.dsc[i] = state.dsc[i];
                }
                nuevoNodo.solution = true;
                return nuevoNodo;
            }
            else {

                int h0[3], h1[3], h2[3], h3[3], h4[3];
                Nodo nH0, nH1, nH2, nH3, nH4;

                for (int i = 0; i < 3; i++) {
                    h0[i] = state.dsc[i];
                    h1[i] = state.dsc[i];
                    h2[i] = state.dsc[i];
                    h3[i] = state.dsc[i];
                    h4[i] = state.dsc[i];
                }

                if (state.dsc[2] == 1) {
                    cout << "Paso dsc es 1  " << endl;
                    //MC
                    h0[0] = h0[0] - 1;
                    h0[1] = h0[1] - 1;
                    h0[2] = h0[2] - 1;
                    //CC
                    h1[1] = h1[1] - 2;
                    h1[2] = h1[2] - 1;
                    //MM
                    h2[0] = h2[0] - 2;
                    h2[2] = h2[2] - 1;
                    //C_
                    h3[1] = h3[1] - 1;
                    h3[2] = h3[2] - 1;
                    //M_
                    h4[0] = h4[0] - 1;
                    h4[2] = h4[2] - 1;
                }

                if (state.dsc[2] == 0) {
                    //MC
                    h0[0] = h0[0] + 1;
                    h0[1] = h0[1] + 1;
                    h0[2] = h0[2] + 1;
                    //CC
                    h1[1] = h1[1] + 2;
                    h1[2] = h1[2] + 1;
                    //MM
                    h2[0] = h2[0] + 2;
                    h2[2] = h2[2] + 1;
                    //C_
                    h3[1] = h3[1] + 1;
                    h3[2] = h3[2] + 1;
                    //M_
                    h4[0] = h4[0] + 1;
                    h4[2] = h4[2] + 1;
                }

                for (int i = 0; i < 3; i++) {
                    nH0.state.dsc[i] = h0[i];
                    nH1.state.dsc[i] = h1[i];
                    nH2.state.dsc[i] = h2[i];
                    nH3.state.dsc[i] = h3[i];
                    nH4.state.dsc[i] = h4[i];
                }
                cout << "nH0 state: " << endl;
                for (int j = 0; j < 3; j++) {
                    cout << nH0.state.dsc[j];
                }
                cout << endl;
                cout << "nH1 state: " << endl;
                for (int j = 0; j < 3; j++) {
                    cout << nH1.state.dsc[j];
                }
                cout << endl;
                cout << "nH2 state: " << endl;
                for (int j = 0; j < 3; j++) {
                    cout << nH2.state.dsc[j];
                }
                cout << endl;
                cout << "nH3 state: " << endl;
                for (int j = 0; j < 3; j++) {
                    cout << nH3.state.dsc[j];
                }
                cout << endl;
                cout << "nH4 state: " << endl;
                for (int j = 0; j < 3; j++) {
                    cout << nH4.state.dsc[j];
                }
                cout << endl;

                nuevoNodo.child[0] = &nH0;
                nuevoNodo.child[1] = &nH1;
                nuevoNodo.child[2] = &nH2;
                nuevoNodo.child[3] = &nH3;
                nuevoNodo.child[4] = &nH4;

                cout << "New nodo child[0] " << endl;
                for (int j = 0; j < 3; j++) {
                    cout << nuevoNodo.child[0]->state.dsc[j];
                }
                cout << endl;
                cout << "New nodo child[1] " << endl;
                for (int j = 0; j < 3; j++) {
                    cout << nuevoNodo.child[1]->state.dsc[j];
                }
                cout << endl;

                return nuevoNodo;
            }
        }
    }
};

int main()
{
    State est;
    est.printstate();

    Nodo nNodo;
    nNodo.state = est;

    Nodo nRes;
    Nodo verN;
    verN = nRes.childGeneration();

    cout << "child[0] " << endl;
    verN.child[0]->state.printstate();
    return 0;
}

Answer 1

您的行为不确定。

在childGeneration函数中，您正在存储指向堆栈变量的指针。这些指针仅在该函数中有效。

您应该考虑改用动态内存分配，或者以其他方式重新考虑您的程序。

数组类指针丢失了主值

1 个答案: