请用while和do while改写，大一新生，请大仙指点

    int i,j,k,n=100;
    while (n < 1000)
    {
        i = n / 100;
        j = n / 10 - i * 10;
        k = n % 10;
        if (n == i*i*i + j*j*j + k*k*k)
            printf("%d",n);
    }