lab6p2

#include <stdio.h>

unsigned selectdigit(unsigned n)
{
    if(n==0)
        return 0;
    else if(n%10>=5)
        return n%10+selectdigit(n/10)*10;
    else
        selectdigit(n/10);
}

unsigned selectdigit1(unsigned n, unsigned pos)
{
    if(n==0)
        return 0;
    else if(pos%2==0)
        return n%10+selectdigit1(n/10, pos+1)*10;
    else
        selectdigit1(n/10, pos+1);
}

int main()
{
    printf("%d \n", selectdigit(2156));
    printf("%d", selectdigit1(3156, 0));

    return 0;
}