lab 10 z2 fatal error

#include <iostream>
#include <cmath>

void kratno(double **mas1, int x1, int y1, double **mas2, int x2, int y2);
void nekratno(double **mas1, int x1, int y1, double **mas2, int x2, int y2);

using namespace std;

int main()
{
    int n1, m1;
    cout << "Enter n1 and m1: " << endl;
    cin >> n1 >> m1;
    double* * A = new double*[n1];
    for (int i = 0; i < n1; i++)
        A[i] = new double[m1];
    for (int i = 0; i < n1; i++)
        for (int j = 0; j < m1; j++)
            cin >> A[i][j];
    int n2, m2;
    cout << "Enter n2 and m2: " << endl;
    cin >> n2 >> m2;
    double* * B = new double*[n2];
    for (int i = 0; i < n2; i++)
        B[i] = new double[m2];
    for (int i = 0; i < n2; i++)
        for (int j = 0; j < m2; j++)
            cin >> B[i][j];
    double sumA = 0;
    double sumB = 0;
    for (int i = 0; i < n1; i++)
        for (int j = 0; j < m1; j++)
            sumA += A[i][j];
    for (int i = 0; i < n2; i++)
        for (int j = 0; j < m2; j++)
            sumB += B[i][j];
    double p;
    double rez = modf(sumA / sumB, &p);
    if (rez == 0)
    {
        kratno(A, n1, m1, B, n2, m2);
    }
    else
    {
        nekratno(A, n1, m1, B, n2, m2);
    }
    for (int i = 0; i < n1; i++)
    {
        cout << endl;
        for (int j = 0; j < m1; j++)
            cout << A[i][j] << " ";
    }
    for (int i = 0; i < 3; i++)
    {
        cout << endl;
    }
    for (int i = 0; i < n2; i++)
    {
        cout << endl;
        for (int j = 0; j < m2; j++)
            cout << B[i][j] << " ";
    }
    return 0;
}

void kratno(double **mas1, int x1, int y1, double **mas2, int x2, int y2)
{
    double temp1, temp2;
    for (int i = 0; i < y1; i++)
    {
        temp1 = mas1[0][i];
        mas1[0][i] = mas1[x1][i];
        mas1[x1][i] = temp1;
    }
    /*for (int i = 0; i < x1; i++)
    {
        cout << endl;
        for (int j = 0; j < y1; j++)
            cout << mas1[i][j] << " ";
    }
    cout << endl;*/
    //для второй матрицы так же написать
    for (int i = 0; i < y2; i++)
    {
        temp2 = mas2[0][i];
        mas2[0][i] = mas2[x2][i];
        mas2[x2][i] = temp2;
    }
    /*for (int i = 0; i < x2; i++)
    {
        cout << endl;
        for (int j = 0; j < y2; j++)
            cout << mas2[i][j] << " ";
    }*/
}
void nekratno(double **mas1, int x1, int y1, double **mas2, int x2, int y2)
{
    double temp1, temp2;
    for (int i = 0; i < y1; i++)
    {
        temp1 = mas1[0][i];
        mas1[0][i] = mas1[x1][i];
        mas1[x1][i] = temp1;
    }
    /*for (int i = 0; i < x1; i++)
    {
        cout << endl;
        for (int j = 0; j < y1; j++)
            cout << mas1[i][j] << " ";
    }
    cout << endl;*/
    //для второй матрицы так же написать
    for (int i = 0; i < 2; i++)
    {
        temp2 = mas2[1][i];
        mas2[1][i] = mas2[x2 - 1][i];
        mas2[x2 - 1][i] = temp2;
    }
    /*for (int i = 0; i < x2; i++)
    {
        cout << endl;
        for (int j = 0; j < y2; j++)
            cout << mas2[i][j] << " ";
    }*/
}