Спорт. прог. лаб 2(in dev...)

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

using namespace std;

int* createArr(int size) {
    int* arr = new int[size];
    for (int i = 0; i < size; i++)
        arr[i] = 0;

    return arr;
}

int* convertToArr(string s, int size) {
    int* arr = createArr(size);

    for (int i = 0; i < s.size(); i++) {
        arr[size - 1 - i] = s[s.size() - 1 - i] - '0';
    }

    return arr;
}

int sign(int *a) {
    return 1;
}

int rank_num(int *c) {
    int c_rank = 0;
    int i = 0;
    bool f = 0;
    while (!f || i < N) {
        i++;
        if (c[i] == 0)
            c_rank++;
        else
            f = 1;
    }
    return c_rank;
}

int compare(int *a, int *b, int q) {
    int rank_a = rank_num(a),
        rank_b = rank_num(b);

    if (q + rank_a == N - 1)
        return 0;
    if (rank_a < rank_b)
        return 1;
    else if (rank_a > rank_b)
        return -1;
    else {
        if (a[rank_a + 1 + q] > b[rank_b + 1 + q])
            return 1;
        else if (a[rank_a + 1 + q] < b[rank_b + 1 + q])
            return -1;
        else {
            return compare(a, b, q + 1);
        }
    }
}

void swap_t(int* a, int* b) {
    int tmp;
    for (int i = 0; i < N; i++) {
        tmp = a[i];
        a[i] = b[i];
        b[i] = tmp;
    }
}

int* sum(int *a, int *b) {
    int* c = createArr(N);
    for (int i = N - 1; i > 0; i--) {
        c[i] = c[i] + a[i] + b[i];
        if (c[i] > 9) {
            c[i - 1] = 1;
            c[i] -= 10;
        }
    }

    return c;
}

int* minus_t(int *a, int *b) {
    int* c = createArr(N);
    for (int i = N - 1; i > 0; i--) {
        c[i] = a[i] - b[i] - c[i];
        if (c[i] < 0) {
            c[i - 1] = 1;
            c[i] += 10;
        }
    }

    return c;
}

void printArr(int *arr, int size) {
    for (int i = 0; i < size; i++)
        cout << arr[i] << " ";
    cout << endl;
}

int main() {

    int *a = convertToArr("85185", N);

    int *b = convertToArr("8182", N);

    int *c = minus_t(a, b);

    printArr(a, N);
    printArr(b, N);

    swap_t(a, b);

    cout << endl;
    printArr(a, N);
    printArr(b, N);

    return 0;
}