Why it works wrong?

Ok i want to change numbers of int tab[4] = {1, 2, 3, 4}; to 1234 number, whats wrong in my code? It shows me 1232

` int main() {

int iloscliczb = 4;
int tab[4] = {1, 2, 3, 4};
int j = 10;
int zmienna = 0;


for( int z = 1, i = 0, k = 2; z < iloscliczb; z++, i++, k++)
{
    zmienna = zmienna + ( tab[iloscliczb - k] *  j );
    j = pow(10, z+1);
}

zmienna = zmienna + ( tab[iloscliczb - 1] );
cout << zmienna << endl;






return 0;

} `