C++ Vector Library - push_back() Function


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Description

The C++ function std::vector::push_back() inserts new element at the end of vector and increases size of vector by one.

Declaration

Following is the declaration for std::vector::push_back() function form std::vector header.

C++98

void push_back (const value_type& val);

C++11

void push_back (const value_type& val);
void push_back (value_type&& val);

Parameters

None

Return value

None.

Exceptions

This member function never throws exception.

Time complexity

Constant i.e. O(1)

Example

The following example shows the usage of std::vector::push_back() function.

#include <iostream>
#include <vector>

using namespace std;

int main(void) {
   vector<int> v;

   /* Insert 5 elements */
   for (int i = 0; i < 5; ++i)
      v.push_back(i + 1);

   for (int i = 0; i < v.size(); ++i)
      cout << v[i] << endl;

   return 0;
}

Let us compile and run the above program, this will produce the following result −

1
2
3
4
5
vector.htm
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