#include <stdbool.h>
#include <stdio.h>
#include <string.h>

bool checkValue(int Max, int Min, int Num) {
    if (Max < Num || Num < Min) {
        printf("Ur value is not belongs [%d%s%d%s" , Min , " ; " , Max , "]\n");
        return false;
    }
    return true;
}

void printArray(int array[]) {
    for (int i = 3; i >= 0; i--) {
        if (i != 3) {
            printf(", ");
        }
        printf("%d", array[i]);
    }
}

int checkCapacity(int Num) {
    int i = 0;
    do {
        Num = Num / 10;
        i++;
    } while (Num != 0);
    return i;
}

bool bitComparison(int Num1, int Num2) {
    if (checkCapacity(Num1) != checkCapacity(Num2)) {
        printf("Digit capacity is not equal, try again\n");
        return false;
    }
    return true;
}

int* arraySplit(int Arr[], int Num) {
    for (int i = 0; i < (4); i++) {
        Arr[i] = Num % 10;
        Num = Num / 10;
    }
    return Arr;
}

int main(int argc, const char * argv[]) {
    int FirstNum = 0;
    int SecondNum = 0;
    do {
        printf("Enter first num\n");
        scanf("%d", &FirstNum);
        printf("Enter second num\n");
        scanf("%d", &SecondNum);
    } while (!bitComparison(FirstNum, SecondNum));
    int ArrOf1[checkCapacity(FirstNum)];
    int ArrOf2[checkCapacity(SecondNum)];
    memcpy(ArrOf1,arraySplit(ArrOf1, FirstNum),checkCapacity(FirstNum));
    memcpy (ArrOf2,arraySplit(ArrOf2, SecondNum),checkCapacity(SecondNum));
    printf("Final nums\n");
    int i = checkCapacity(FirstNum) - 1;
    for (; i != -1; i--) {
        ArrOf1[i] -= ArrOf2[i];
        printf("%d", ArrOf1[i]);
    }
    printf("\n");
    return 0;
}