C++ Vector insert()

It is used to insert new element at specified position.

Syntax

Consider a vector v. Syntax would be:

insert(iterator,val);
insert(iterator,n,val);
insert(iterator,InputIterator first,InputIterator last);

Parameter

iterator:An iterator defines the position, where the new elements are to be inserted.
val: The valspecifies the value which is to be inserted.
n: Number of times the value is to be occurred.
(first,last): It defines the range of elements which is to be inserted.

Return value

It returns an iterator pointing to the newly inserted element.

Example 1

Let's see a simple example.

#include<iostream>
#include<vector>
using namespace std;
int main()
{
vector<string> v{"java"};
stringstr="programs";
v.insert(v.begin()+1,str);
for(int i=0;i<v.size();i++)
cout<<v[i]<<" ";
return 0;
}

Output:

java programs

In this example, string "programs" is inserted in vector 'v' using insert() function.

Example 2

Let's see a simple example.

#include<iostream>
#include<vector>
using namespace std;
int main()
{
vector<string>  v{"C" ,"Tutorials"};
v.insert(v.begin()+1,2,"C");
for(int i=0;i<v.size();i++)
cout<<v[i]<<" ";
return 0;
}

Output:

C CC Tutorials

Example 3

Let's see a simple example.

#include<iostream>
#include<vector>
using namespace std;
int main()
{
	vector<int> v{1,2,3,4,5};
	vector<int> v1{6,7,8,9,10};
	v.insert(v.end(),v1.begin(),v1.begin()+5);
	for(int i=0;i<v.size();i++)
	cout<<v[i]<<" ";
	return 0;
}

Output: