Vector a 赋值 Vector b
时间: 2024-05-24 14:13:30 浏览: 5
As an AI language model, I don't have access to the context for this statement. But the general meaning of this statement is "Vector a is assigned the value of Vector b". It means that the elements of Vector b are copied into Vector a, and now Vector a has the same values as Vector b.
相关问题
vector单个赋值
vector单个赋值可以通过下标访问vector中的元素并进行赋值,例如:
```cpp
vector<int> vec{1, 2, 3, 4};
vec = 10; // 将vec中第一个元素赋值为10
```
另外,也可以使用迭代器访问vector中的元素并进行赋值,例如:
```cpp
vector<int> vec{1, 2, 3, 4};
auto it = vec.begin();
*it = 10; // 将vec中第一个元素赋值为10
```
如果要将vector中所有的元素都赋值为同一个值,可以使用STL算法库中的`std::fill()`函数,例如:
```cpp
vector<int> vec{1, 2, 3, 4};
std::fill(vec.begin(), vec.end(), 10); // 将vec中所有元素都赋值为10
```
vector连续赋值
以下是vector连续赋值的两种方法:
1.使用push_back()方法向vector末尾添加元素:
```cpp
#include <iostream>
#include <vector>
using namespace std;
int main() {
vector<int> vec;
for(int i=1; i<=5; i++) {
vec.push_back(i);
}
for(int i=0; i<vec.size(); i++) {
cout << vec[i] << " "; // 输出:1 2 3 4 5
}
return 0;
}
```
2.通过截取数组中一段连续的数值赋值给vector:
```cpp
#include <iostream>
#include <vector>
using namespace std;
int main() {
int arr[] = {1, 2, 3, 4, 5};
vector<int> vec(arr, arr+5);
for(int i=0; i<vec.size(); i++) {
cout << vec[i] << " "; // 输出:1 2 3 4 5
}
return 0;
}
```