Cin With Spaces and “,”

问题

I am trying to figure out how to take a string that a user enters with space as a single string. Moreover, after that, the user will include other strings separated by commas.

For example, foo,Hello World,foofoo where foo is one string followed by Hello World and foofoo.

What I have right now, it would split Hello World into two strings instead of combining them into one.

int main()
{
    string stringOne, stringTwo, stringThree;
    cout << "Enter a string with commas and a space";
    cin >> stringOne;  //User would enter in, for this example foo,Hello World,foofoo

    istringstream str(stringOne);

    getline(str, stringOne, ',');       
    getline(str, stringTwo, ',');
    getline(str, stringThree);

    cout << stringOne; //foo
    cout << endl;
    cout << stringTwo; //Hello World <---should be like this, but I am only getting Hello here
    cout << endl;
    cout << stringThree; //foofoo
    cout << endl;
}

How do I get Hello World into stringTwo as a single string instead of two.

回答1:

Your input is:

foo,Hello World,foofoo

Your first line that reads input from std::cin is:

cin >> stringOne;

That line reads everything until it finds the first whitespace character to stringOne. After that line, the value of strinOne will be "foo,Hello".

In the lines

getline(str, stringOne, ',');       
getline(str, stringTwo, ',');

"foo" is assigned to stringOne and "Hello" is assigned to stringTwo.

In the line

getline(str, stringThree);

nothing is assigned to stringThree since there is nothing else left in the str object.

You can fix the problem by changing the first line that reads from std::cin so that the entire line is assigned to stringOne, not the contents up to the first whitespace character.

getline(cin, stringOne);

istringstream str(stringOne);

getline(str, stringOne, ',');       
getline(str, stringTwo, ',');
getline(str, stringThree);

来源：https://stackoverflow.com/questions/48980998/cin-with-spaces-and

标签

c++

string

getline