#include <iostream>
#include <stdio.h>

#define N 100
struct _Decimal
{
    char a[N];
    unsigned int n;

};

typedef struct _Decimal Decimal;

void div10(Decimal* res, const Decimal* b)
{
    unsigned int n = b->n;
    res->a[0] = b->a[n - 1];
    res->a[1] = b->a[n];
}

int main(){
    Decimal a = {{7, 4, 1}, 2};  // set number 147
    Decimal res;

    div10(&res, &a);           // res = a/10 = 147/10 = 14

    printf("%u", &res);          // print 14
    printf("\n");

    return 0;
}