Q:

Vectors in C++ Standard Template Library (STL)

mahmoud2506
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2022-05-05
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Syntax: vector<type>vector_name;

Example: vector<int>v;

Some useful member functions of vectors

  1. push_back(): This function add a new element at the end of vector after its current last element.
  2. pop_back(): This function removes the last element from the vector.
  3. begin(): It returns a iterator pointing to the first element of the vector.
  4. end(): It returns a iterator pointing to the last elements of the vector.
  5. size(): This function returns the size(number of elements) of the vector.
  6. clear(): It removes all the elements of the vector, making it empty with size 0.
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mahmoud2506
2022-05-05
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C++ program to implement vectors using STL

#include <iostream>
#include <vector>
using namespace std;

int main()
{ 
	int i,k;
	//vector declaration
	vector<int>v;
	
	//printing size before insertion
	cout<<"Before Insertion:"<<v.size()<<endl;
	
	//input elements
	cout<<"Enter Elements:";
	for(int i=1;i<5;i++)
	{ 
		cin>>k;
		v.push_back(k);
	}
	
	cout<<"Size after Push_back():"<<v.size()<<endl;
	v.pop_back();
	
	cout<<"Size after Pop_back():"<<v.size()<<endl;
	cout<<"Elements Present in vector are:";
	for(vector<int>::iterator j=v.begin();j!=v.end();j++)
		cout<<*j<<" ";
	cout<<endl;
	
	//clearing vector
	v.clear();
	cout<<"After clear():"<<v.size()<<endl;
	
	return 0;
}

Output

 
Before Insertion:0
Enter Elements:4 86 23 1
Size after Push_back():4
Size after Pop_back():3
Elements Present in vector are:4 86 23
After clear():0

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