如何在循环中向空向量添加元素?

2021-12-21 00:00:00 insert vector c++

我正在尝试在循环内创建一个空向量，并且希望在每次将某些内容读入该循环时向该向量添加一个元素.

I am trying to create an empty vector inside a loop, and want to add an element to the vector each time something is read in to that loop.

#include <iostream>
#include <vector>

using namespace std;

int main()
{
   std::vector<float> myVector();

   float x;
   while(cin >> x)
      myVector.insert(x);

   return 0;
}

但这给了我错误信息.

推荐答案

您需要使用 std::vector::push_back() 代替:

You need to use std::vector::push_back() instead:

while(cin >> x)
  myVector.push_back(x);
//         ^^^^^^^^^

而不是 std::vector::insert()，正如你在链接中看到的，它需要一个迭代器来指示你想要插入元素的位置.

and not std::vector::insert(), which, as you can see in the link, needs an iterator to indicate the position where you want to insert the element.

另外，作为 @Joel 评论了什么，您应该删除向量变量定义中的括号.

Also, as what @Joel has commented, you should remove the parentheses in your vector variable's definition.

std::vector<float> myVector;

和不是

std::vector<float> myVector();

通过执行后者，您会遇到 C++ 的最烦人的解析问题.

By doing the latter, you run into C++'s Most Vexing Parse problem.

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