int StringToInt(char *hex)

{

    return CharToInt(hex[]) *  + CharToInt(hex[]);

}

int CharToInt(char hex)

{

    if (hex>='' && hex <='')

        return hex - '';

    if (hex>='A' && hex <= 'F')

        return hex-'A'+;

    if(hex>='a' && hex <= 'f')

        return hex-'a'+;

    return -;

}