Палиндром

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int a, st, ml, ost;
    int pal = 1;
    int len = 0;
    scanf("%d", &a);
    int ac = a;
    while (ac != 0) {
        len++;
        ac /= 10;
    }
    for (int i = 0; i <= (len / 2); i++) {
        ost = pow(10, len - 2 * i - 1);
        st = a / ost;
        ml = a % 10;
        if (st != ml) {
            pal = 0;
            break;
        }
        a = (a - ost * st) / 10;
        if (a == 0) {
            break;
        }
    }
    if (pal == 1) {
        printf("palindrome");
    } else {
        printf("not palindrome");
    }
    return 0;
}