从getline获取2个字符串变量

Question

I'm curious if it's possible to put letters out of a getline function into 2 separate string variables, sorry if it's hard to understand but I'll explain this further.

Let's say I have a 'string x;' variable, I use a 'getline(cin, x)' and then I were to run this and type in for example 'hello world'. Would it be possible to put 'hello' and 'world' into 2 separate string variables?

For example: It will store the first letter keep on adding letters to a variable until it hits a whitespace, then keep on adding letters to the next variable until it reaches another whitespace.

I understand I might have explained this poorly, and if it's not understandable let me know and I'll try explain more.

Answer 1

the stream operator>> functions already handle whitespace formatting for you, the canonical way to handle an unknown number of tokens on each line is to do something like the following:

std::string line;
getline(std::cin, line);

std::istringstream iss(line);
std::string token;
while (iss >> token) {
  // Do something with token
}

If you don't care about what kind of whitespace is used to separate the tokens this can be simplified to

std::string token;
while (std::cin >> token) {
  // Do something with token
}

Answer 2

You need a way to parse the string using a delimiter (in this case a space ' ').

This post has about a thousand different functions that can solve what you are trying to do.

Split a string in C++?

Easiest way to do this if you know how many variables you will need would be to take advantage of the default std::cin implementation of using space as a delimiter:

std::string x1, x2;          // define two strings
std::cin >> x1 >> x2;        // user enters "Hello World"
std::cout << x1 <<" "<< x2;  // x1 = "Hello", x2 = "World"