#include<stdio.h>
#include<conio.h>
int deQuyDuoi(int n, int Max = 0)
{
if(n == 0)
return Max;
return deQuyDuoi(n / 10, Max > n % 10 ? Max: n % 10);
}
int khuDeQuy(int n)
{
int Max = 0;
do
{
int chuso = n % 10;
if(chuso > Max)
Max = chuso;
}while(n /= 10);
return Max;
}
int main()
{
int n;
printf("\nNhap n: "); scanf("%d", &n);
printf("\nDe quy duoi %d chu so max = %d", n, deQuyDuoi(n));
printf("\nKhu de quy %d chu so max = %d", n, deQuyDuoi(n));
getch();
return 0;
}