Код ошибки sigsegv

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#ifndef OOP_CLION_VECTOR_H
#define OOP_CLION_VECTOR_H
 
#endif //OOP_CLION_VECTOR_H
 
#include <math.h>
#include <float.h>
#include <conio.h>
#include <iostream>
#include <Windows.h>
#include <string>
#include <iostream>
#include <sstream>
#include <string>
 
using namespace std;
static char *ValueOverflow = "Value overflow exception!n";
static char *IncorrectSize = "Size of the vector is incorrect!n";
static char *DivisionByZero = "Division by zero!n";
 
class Vector {
    friend Vector &operator-(const int a, const Vector &b);
 
private:
    int size;
    int *num;
    char name;
 
public:
    Vector(int size);
 
    Vector(char name);
 
    Vector(int size, char name);
 
    Vector();
 
    Vector (const Vector &initial);
 
    ~Vector();
 
    void showVector();
 
    void inputVector();
 
    char getName() const;
 
    int  getSize() const;
 
    void setSize(int s);
 
    Vector operator-(const int &n);
 
    Vector operator/(const Vector &v1);
 
    const Vector& operator=(const Vector &right);
 
    const Vector& operator=(const int &n);
 
    bool operator==(const Vector &arrInt);
 
    bool operator>(const Vector &arrInt);
 
    bool operator<(const Vector &arrInt);
};

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#include "Vector.h"
#include "climits"
#include <assert.h>
 
Vector::Vector(int parSize) {
    size = parSize;
    num = new int[size];
    assert(num!=0);
    for (int i = 0; i < size; i++) {
        num[i] = 0;
    }
}
 
Vector::Vector() {
    size = 0;
    num = 0;
}
 
Vector::~Vector() {
    delete[] num;
 
}
 
void Vector::showVector() {
    for (int i = 0; i < size; i++) {
        cout << "[" << num[i] << "]";
    }
    cout << "n";
}
 
void Vector::inputVector() {
    if (size < 1 || size > 1000) throw IncorrectSize;
 
    num = new int[size];
    for (int i = 0; i < size; i++) {
        num[i] = 0;
    }
    if (size <= 10) {
        for (int i = 0; i < this->size; i++) {
            cout << "Enter Vector " << name << "[" << i << "]: ";
            while (!(cin >> num[i])) {
                cout << "Incorrect input! Please try again." << endl;
                cout << "Enter Vector " << name << "[" << i << "]: ";
                cin.clear();
                while (cin.get() != 'n') { continue; }
            }
            while (cin.get() != 'n') { continue; }
        }
    } else {
        cout << "Vector " << name << " filled randomly!n";
        for (int i = 0; i < size; i++) {
            num[i] = rand() % size;
        }
    }
}
 
char Vector::getName() const {
    return name;
}
 
bool Vector::operator==(const Vector &arrInt) {
    int sumArrInt = 0;
    int sumThis = 0;
    for (int i = 0; i < this->size; i++) {
        sumThis += this->num[i];
    }
    for (int i = 0; i < arrInt.size; i++) {
        sumArrInt += arrInt.num[i];
    }
    if (sumThis == sumArrInt) {
        return true;
    } else return false;
}
 
bool Vector::operator>(const Vector &arrInt) {
    int sumArrInt = 0;
    int sumThis = 0;
    for (int i = 0; i < this->size; i++) {
        sumThis += this->num[i];
    }
    for (int i = 0; i < arrInt.size; i++) {
        sumArrInt += arrInt.num[i];
    }
    if (sumThis > sumArrInt) {
        return true;
    } else return false;
}
 
bool Vector::operator<(const Vector &arrInt) {
    int sumArrInt = 0;
    int sumThis = 0;
    for (int i = 0; i < this->size; i++) {
        sumThis += this->num[i];
    }
    for (int i = 0; i < arrInt.size; i++) {
        sumArrInt += arrInt.num[i];
    }
    if (sumThis < sumArrInt) {
        return true;
    } else return false;
}
 
Vector Vector::operator-(const int &n) {
    Vector tmp(*this);
    for (int i = 0; i < size; i++) {
        long double t = 0;
        t = this->num[i] - n;
        if ((t > INT_MAX || t < INT_MIN) || t != (int) t) throw ValueOverflow;
        tmp.num[i] = (int) t;
    }
    return tmp;
}
 
Vector Vector::operator/(const Vector &v1) {
    int s = 0;
    Vector tmp;
    if (this->size > v1.size) {
        tmp = Vector(*this);
        s = this->size;
    } else {
        tmp = Vector(v1);
        s = v1.size;
    }
 
    for (int i = 0; i < s; i++) {
        if (v1.num[i] == 0) throw DivisionByZero;
        long double t = this->num[i] / v1.num[i];
        if ((t > INT_MAX || t < INT_MIN) || t != (int) t) throw ValueOverflow;
        tmp.num[i] = (int) t;
    }
    return tmp;
}
 
Vector &operator-(int a, const Vector &b) {
    Vector tmp(b.size);
    for (int i = 0; i < b.size; i++) {
        tmp.num[i] = a - b.num[i];
    }
    return tmp;
}
 
const Vector &Vector::operator=(const Vector &right) {
    if (this != &right){
    delete[] num;
    size = right.size;
    num = new int[size];
    assert(num != 0);
    for (int i = 0; i < size; i++) {
        num[i] = right.num[i];
    }
    }
    return *this;
}
 
Vector::Vector(int parSize, char parName) {
    size = parSize;
    num = new int[size];
    assert(num!=0);
    name = parName;
    for (int i = 0; i < size; i++) {
        num[i] = 0;
    }
}
 
void Vector::setSize(int parSize) {
    size = parSize;
}
 
Vector::Vector(char parName) {
    name = parName;
}
 
int Vector::getSize() const {
    return size;
}
 
const Vector& Vector::operator=(const int &n) {
    //if (v != this){
    delete[] num;
    size = 1;
    num = new int[size];
    num[0] = n;
    return *this;
}
 
Vector::Vector(const Vector &initial) {
    size = initial.size;
    num = new int[size];
    assert(num!=0);
    for (int i = 0; i < size; i++)
        num[i] = initial.num[i];
}

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#include <iostream>
#include "Vector.h"
 
int inputSize() {
    int inpS = 0;
    while (!(cin >> inpS) || inpS < 1 || inpS > 1000) {
        cout << "Incorrect size. Try again: ";
        cin.clear();
        while (cin.get() != 'n') { continue; }
    }
    while (cin.get() != 'n') { continue; }
    return inpS;
}
 
int main() {
    int esc = 27, key = 0, t = 0, ia, ib;
    Vector *a;
    Vector *b;
    Vector *x;
    do {
        try {
            cout << "---------------------TEST#_" + to_string(++t) + "---------------------n";
            cout << "t 1-b/a tt a>b" << endl;
            cout << "t -10 tt a=b" << endl;
            cout << "t (a-52)/b t a<b" << endl;
 
            *a = Vector('a');
            cout << "Enter size of vector " << a->getName() << " :";
            a->setSize(inputSize());
            if (a->getSize() == 1) {
                cout << "Enter element: ";
                cin >> ia;
                *a = ia;
            } else {
                a->inputVector();
            }
            a->showVector();
 
            *b = Vector('b');
            cout << "Enter size of vector " << b->getName() << " :";
            b->setSize(inputSize());
            if (b->getSize() == 1) {
                cout << "Enter element: ";
                cin >> ib;
                *b = ib;
            } else {
                b->inputVector();
            }
            b->showVector();
 
            *x = Vector('x');
 
            if (*a == *b) {
                cout << "a and b is equal!" << endl;
            } else if (*a < *b) {
                cout << "a is smaller than b!" << endl;
            } else if (*a > *b) {
                cout << "a is bigger than b!" << endl;
            }
 
            if (*a > *b) { *x = 1 - (*b / *a); }
            else if (*a == *b) { *x = -10; }
            else { *x = (*a - 52) / *b; }
            x->showVector();
 
            delete &a, &b, &x;
 
            cout << "Press Esc to exit or any other key to continue...n";
            key = _getch();
        }
        catch (char *message) {
            cout << message << endl;
        }
        catch (...) {
            cout << "Handling unexpected exception..." << endl;
        }
    } while (key != esc);
    return 0;
}