如何在循环中将元素添加到空向量? [英] how do i add elements to an empty vector in a loop?
问题描述
我正在尝试在循环内创建一个空向量,并希望在每次向该循环中读取某些内容时向该向量中添加一个元素。
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;
}
但这给了我错误消息。
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()
,如您在链接中所见,它需要一个迭代器来指示要插入元素的位置。
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.
此外,如 @Joel有何评论,则应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 ++的最令人讨厌的解析问题。
By doing the latter, you run into C++'s Most Vexing Parse problem.
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