C++ <vector> - pop_back() Function

The C++ vector::pop_back function is used to delete the last element of the vector. Every deletion of element results into reducing the container size by one unless the vector is empty.

Syntax

C++98
C++11

void pop_back();

void pop_back();

Parameters

No parameter is required.

Return Value

None.

Time Complexity

Constant i.e, Θ(1).

Example:

In the example below, the vector::pop_back function is used to delete last elements of the vector called MyVector.

#include <iostream>
#include <vector>
using namespace std;
 
int main (){
  vector<int> MyVector{100, 200, 300, 400, 500, 600};
  vector<int>::iterator it;

  //deletes last element of the vector
  MyVector.pop_back();
  //deletes next last element of the vector
  MyVector.pop_back();

  cout<<"The vector contains:";
  for(it = MyVector.begin(); it != MyVector.end(); ++it)
    cout<<" "<<*it;

  return 0;
}

The output of the above code will be:

The vector contains: 100 200 300 400

❮ C++ <vector> Library