push front vector cpp
To push an element to the front of a vector in C++, you can use the insert()
function provided by the vector
container.
Here are the steps to push an element to the front of a vector:
- Create a vector: First, you need to create a vector using the
std::vector
class. For example, you can declare a vector of integers like this:
std::vector<int> myVector;
- Insert an element at the front: To insert an element at the front of the vector, you can use the
insert()
function along with the iterator representing the beginning of the vector. Theinsert()
function takes two arguments: the iterator position and the value to be inserted. For example, to insert the value10
at the front of the vector, you can do:
myVector.insert(myVector.begin(), 10);
After this step, the vector will contain the element 10
at the front, and any existing elements will be shifted to the right.
- Access the vector elements: You can access the elements of the vector using the index operator
[]
. For example, to access the element at the front of the vector, you can do:
int frontElement = myVector[0];
In this case, frontElement
will contain the value 10
.
That's it! You have successfully pushed an element to the front of a vector in C++. Remember to include the necessary headers (<vector>
) at the beginning of your code to use the std::vector
class.