c++ - 如何在一行中用户输入c++中的数组元素

Question

本人初学c++，基本属于PHP。所以我正在尝试编写一个程序来练习，对数组进行排序。我已经成功创建了静态数组值为

的程序

// sort algorithm example
#include <iostream>     // std::cout
#include <algorithm>    // std::sort
#include <vector>       // std::vector


bool myfunction (int i,int j) { return (i<j); }

struct myclass { bool operator() (int i,int j) { return (i<j);} } myobject;

int main () {
   int myints[] = {55,82,12,450,69,80,93,33};
  std::vector<int> myvector (myints, myints+8);               

  // using default comparison (operator <):
  std::sort (myvector.begin(), myvector.begin()+4);           

  // using function as comp
  std::sort (myvector.begin()+4, myvector.end(), myfunction); 

  // using object as comp
  std::sort (myvector.begin(), myvector.end(), myobject);     

  // print out content:
  std::cout << "myvector contains:";
  for (std::vector<int>::iterator it=myvector.begin(); it!=myvector.end(); ++it)
    std::cout << ' ' << *it;
    std::cout << '\n';

  return 0;
}

它的输出没问题。但我希望元素应该从用户输入， space separated 或 , separated 。所以我试过了

int main () {
    char values;
    std::cout << "Enter , seperated values :";
    std::cin >> values;
  int myints[] = {values};


  /* other function same */
}

它在编译时没有抛出错误。但是 op 并不像要求的那样。这是

Enter , seperated values :20,56,67,45

myvector contains: 0 0 0 0 50 3276800 4196784 4196784

------------------ (program exited with code: 0) Press return to continue

Answer 1

你可以使用这个简单的例子:

#include <iostream>
#include <string>
#include <sstream>
#include <algorithm>

using namespace std;

int main()
{
    stringstream ss;
    string str;
    getline(cin, str);
    replace( str.begin(), str.end(), ',', ' ');
    ss << str;

    int x = 0;
    while (ss >> x)
    {
        cout << x << endl;
    }
}

Live demo

---

或者，如果你想让它更通用并且很好地包含在返回 std::vector 的函数中:

#include <iostream>
#include <string>
#include <sstream>
#include <algorithm>
#include <vector>

using namespace std;

template <typename T>
vector<T> getSeparatedValuesFromUser(char separator = ',')
{
    stringstream ss;
    string str;
    getline(cin, str);
    replace(str.begin(), str.end(), separator, ' ');
    ss << str;

    T value{0};
    vector<T> values;
    while (ss >> value)
    {
        values.push_back(value);
    }

    return values;
}

int main()
{
    cout << "Enter , seperated values: ";
    auto values = getSeparatedValuesFromUser<int>();

    //display values
    cout << "Read values: " << endl;
    for (auto v : values)
    {
        cout << v << endl;
    }
}

Live demo