printf(), fprintf(), wprintf() and NSlog() won't print on XCode
wchar_t *polynomial_description( double *polyArray, char size, char var ){

    wchar_t *descriptionString, temp[100];
    int len, counter = 0;
    SUPERSCRIPT superscript;

    descriptionString = (wchar_t *) malloc(sizeof(wchar_t) * 2);
    descriptionString[0] = '';

    while( counter < size ){

        superscript = polynomial_utilities_superscript( size - counter );
        len = swprintf(temp, 100, L"%2.2f%c%c +", polyArray[counter], var, superscript);
        printf("temp size: %dn", len);

        descriptionString = (wchar_t *) realloc(descriptionString, sizeof(wchar_t) * (wcslen(descriptionString) + len + 1) );
        wcscat(descriptionString, temp);

        counter++;

    }

    //fflush(stdout); //Already tried this
    len = wprintf(L"%lsn", descriptionString);
    len = printf("%ls**n", descriptionString);
    len = fprintf(stdout, "%ls*n", descriptionString);
    len = printf("FFS!! Print something!");

    return descriptionString;

}

int main(int argc, char **argv)
{
    // Run "locale -a" in the Terminal to get a list of all valid locales
    setlocale(LC_ALL, "en_US.UTF-8");
    ...
}