how do i make my program notice if the cin contains a specific word in it?-CodePudding

Beginner here.

I am writing a program, and I want it to take my input and see if what I typed contains a certain keyword, like "hello", for example.

I know how to make it do something if my input is exactly what it's looking for, like if I typed "hello" exactly, but what if I typed "hello there"?

It's not exactly "hello", but my input contains it -- so, how do I make the program recognize if that word is in the input at all?

I am trying to make a simple "chatbot" (obviously not real AI, just an idea). This is what I have so far:

string ans;

cout << "Hello, I am Oliver, a Chatbot" <<endl;
cout << "What can I do for you today?" <<endl;
cin >> ans;

How do I make it check if the cin, ans, contains a specific word, like "hello"?

CodePudding user response：

Use std::string::find(), eg:

string ans;

cout << "Hello, I am Oliver, a Chatbot" <<endl;
cout << "What can I do for you today?" <<endl;
cin >> ans;

if (ans.find("hello") != string::npos) {
    // found
}
else {
    // not found
}