C++ in ubuntu pop up message via notify-send command . zenity command

void Util::threadLambda170(int x, int y)
{
    thread t1([](int x, int y)
              {
        auto result=pow(x,y);
        cout<<fixed<<"Pow="<<result<<endl; },
              x, y);
    t1.join();

    string str("/usr/bin/notify-send "Finished in void Util::threadLambda170(int x,int y) " ");
    str.append(getTimeNow35());
    system(str.c_str());
}

void Util::threadLambda170(int x, int y)
{
    thread t1([](int x, int y)
              {
        auto result=pow(x,y);
        cout<<fixed<<"Pow="<<result<<endl; },
              x, y);
    t1.join();

    string str;
    str.append("zenity --info --text=");
    str.append(""Finished in void Util::threadLambda170(int x,int y)n"");
    str.append(getTimeNow35());
    int cmdResult = system(str.c_str());
    cout<<"cmdResult="<<cmdResult<<",in "<<__LINE__<<endl;    
}

void Util::notifysend172()
{
    string str;
    str.append("notify-send ");
    str.append(""In void Util::notifysend172() "");
    str.append(" "Now is "");
    str.append(getTimeNow35());
    system(str.c_str());
}