Mucim se z nalogo C++

#include <iostream>
#include <sstream>

int zamenjaj(int n)
{
    std::stringstream s;
    std::string snum;

    if(n >= 0)
    {
        s << n;
        s >> snum;
        std::swap(snum[0], snum[snum.length()-1]);
        return (atoi(snum.c_str()));
    }
    else
        {
            s << n;
            s >> snum;
            std::swap(snum[1], snum[snum.length()-1]);
            return (atoi(snum.c_str()));
        }
}

int SwapFirstLast(int n)
{
    int s = 1;
    if (n<0) n*=(s*=-1);
    int l = n%10;
    n/=10;
    int m = n*10;
    int i = 1;
    while ((n>0)&&(i*=10)) n/=10;
    return s*(l*i+m%i+m/i);
}