Cin With Space和“，" [英] Cin With Spaces and ","

问题描述

我试图弄清楚如何将用户输入的string与空格作为单个string一起使用.而且，此后，用户将包括其他用逗号分隔的strings.

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.

例如，foo,Hello World,foofoo，其中foo是一个string，后跟Hello World和foofoo.

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

我现在拥有的东西，它将把Hello World分成两个strings而不是将它们组合成一个.

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;
}

如何将Hello World作为单个字符串而不是两个字符串输入到stringTwo中.

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

推荐答案

您的输入是:

foo,Hello World,foofoo

从std::cin读取输入的第一行是:

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

cin >> stringOne;

该行将读取所有内容，直到找到stringOne的第一个空格字符为止.在该行之后，strinOne的值将为"foo,Hello".

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

在线

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

将

"foo"分配给stringOne，将"Hello"分配给stringTwo.

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

在线

getline(str, stringThree);

没有任何内容分配给stringThree，因为str对象中没有其他内容.

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

您可以通过更改从std::cin读取的第一行来解决此问题，以便将整个行分配给stringOne，而不是将内容分配给第一个空格字符.

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);

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