How Can I Open A Youtube Link Using A C++ Program?

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C++

I have this C++ program and my goal is that i will enter a string and then my program will automatically look for that string in the youtube and list me the videos. But i am facing some problems- I am using the system() to open the youtube link and i dont know how i can pass my string in the youtube search query. I think i can better explain this with my code- Here is my code.

string I;

cout<<"Enter i"<<endl;
getline(cin,I);

if(I =="r")
{
system("start https://www.youtube.com/results?search_query=r");


}

Here is the problem, i want my program to automatically pass the sting i entered in the youtube search link . I mean to say that whatever string i enter should automatically be passed on to (search_query = string entered).
I am not being able to do that. Is there a way to do that?

Thanks