#include<iostream>
#include<string>
#define N 10

using namespace std;

struct Number{

    int num[N];
    int length;

};

int init(Number* a) {
    for (int i = 0; i < N; i++)
        a->num[i] = 0;
}

void output(Number* a) {
   int i = 0;

    while (i < N && a->num[i] == 0)
        i++;

    if (i == N)
        cout << "0";

    for (i = 0; i < N; i++) {
        cout << a->num[i];
    }

    cout << endl;
}

void enter(Number* a, Number* b) {
    string str;
    int length;

    for (int i = 0; i < N; i++) {
        a->num[i] = 0;
        b->num[i] = 0;
    }

    cout << "Enter the sign: " << endl;
    cin >> str;

    a->length = str.length();

    for (int i = 0; i < str.length(); i++) {
        a->num[N - str.length() + i] = str[i] - '0';
    }

    cout << "Enter the sign: " << endl;
    cin >> str;

    b->length = str.length();

    for (int i = 0; i < str.length(); i++) {
        b->num[N - str.length() + i] = str[i] - '0';
    }
}
int sum(Number* a, Number* b, Number* c) {

    for (int i = N - 1; i >= 0; i--) {
        c->num[i] = a->num[i] + b->num[i] + c->num[i];

        if (c->num[i] > 9) {
            c->num[i] = c->num[i] - 10;
            c->num[i - 1]++;
        }
    }

    output(c);
}


char compare(Number* a, Number* b) {

    int i = N - a->length;
    int j = N - b->length;

    if (i > j)
        return '<';
    else if (i < j)
        return '>';
    else {
        if (a->num[i] > b->num[j])
            return '>';
        else if (a->num[i] < b->num[j])
            return '<';
        else {
            while (true) {
                if (a->num[i] > b->num[j])
                    return '>';
                else if (a->num[i] < b->num[j])
                    return '<';
                i++;
                j++;
                if (i == N || j == N)
                    return '=';
            }
        }
    }
}

int minus(Number* a, Number* b, Number* c) {

    for (int i = N - 1; i >= 0; i--) {

        if (a->num[i] < b->num[i]) {
            a->num[i] += 10;
            a->num[i - 1] -= 1;
        }
        if (a->num[i] == b->num[i]) {
            c->num[i] = 0;
        }
        c->num[i] = a->num[i] - b->num[i];

    }
    output(c);
}


int main() {
    int i, j;

    Number* a = new Number[N];
    Number* b = new Number[N];
    Number* c = new Number[N];

    init(c);
    enter(a, b);

    char comp = compare(a, b);

    cout << endl << "The 1st number " << comp << endl << endl;

    cout << "The sum = ";
    sum(a, b, c);

    cout << "The subtraction is ";
    if (comp == '>' || comp == '=')
        minus(a, b, c);
    else {
        cout << " - ";
        minus(b, a, c);
    }

    cout << endl;

    system("pause");
    return 0;
}