C++ 'Using space as a delimiter' [closed]

问题

Closed. This question is off-topic. It is not currently accepting answers.

---

Want to improve this question? Update the question so it's on-topic for Stack Overflow.

Closed 6 years ago.

I am a complete beginner in C++, and am trying to do the following program:

---

1. Read a sentence from the console.
2. Break the sentence into words using the space character as a delimiter.
3. Iterate over each word, if the word is a numeric value then print its value doubled, otherwise print out the word, with each output on its own line.

---

I am really lost on how to do this. Especially using the space key as a delimiter.

回答1:

Can have something like following :

With std::stringstream and std::getline

std::string str;
std::string temp;
std::getline(std::cin,str);

std::stringstream ss(str);

while(getline(ss,temp, ' ')) // delimiter as space
{
      std::stringstream stream(temp);
      if(stream >> val)
        std::cout<<2*val<<std::endl;
      else 
        std::cout<<temp<<std::endl;
}

See DEMO

来源：https://stackoverflow.com/questions/18597850/c-using-space-as-a-delimiter