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vector insert() function in C++ STL
vector insert() function in C++ STL helps to increase the size of a container by inserting the new elements before the elements at the specified position.
It is a predefined function in C++ STL.
We can insert values with three types of syntaxes
1. Insert values by mentioning only the position and value:
vector_name.insert(pos,value);
2. Insert values by mentioning the position, value and the size:
vector_name.insert(pos,size,value);
3. Insert values in another empty vector form a filled vector by mentioning the position, where the values are to be inserted and iterators of filled vector:
empty_eector_name.insert(pos,iterator1,iterator2);
Algorithm
Begin Declare a vector v with values. Declare another empty vector v1. Declare another vector iter as iterator. Insert a value in v vector before the beginning. Insert another value with mentioning its size before the beginning. Print the values of v vector. Insert all values of v vector in v1 vector with mentioning the iterator of v vector. Print the values of v1 vector. End.
Example
#include<iostream>
#include <bits/stdc++.h>
using namespace std;
int main() {
vector<int> v = { 50,60,70,80,90},v1; //declaring v(with values), v1 as vector.
vector<int>::iterator iter; //declaring an iterator
iter = v.insert(v.begin(), 40); //inserting a value in v vector before the beginning.
iter = v.insert(v.begin(), 1, 30); //inserting a value with its size in v vector before the beginning.
cout << "The vector1 elements are: \n";
for (iter = v.begin(); iter != v.end(); ++iter)
cout << *iter << " "<<endl; // printing the values of v vector
v1.insert(v1.begin(), v.begin(), v.end()); //inserting all values of v in v1 vector.
cout << "The vector2 elements are: \n";
for (iter = v1.begin(); iter != v1.end(); ++iter)
cout << *iter << " "<<endl; // printing the values of v1 vector
return 0;
}Output
The vector1 elements are: 30 40 50 60 70 80 90 The vector2 elements are: 30 40 50 60 70 80 90
Updated on: 30-Jul-2019
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