C++ vector insert() Usage and Example

C++ Vector (Container)

Used to insert a new element at a specified position.

Syntax

The syntax of vector (vector).insert() is:

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

Parameter

• iterator：The iterator defines the position where the new element will be inserted.

• val：val is the value to be inserted.

• n：The number of times this value appears.

• （first，last）：It defines the range of elements to be inserted.

Return value

It returns an iterator pointing to the newly inserted element.

Example1

The insert() function inserts a string into the vector.

Example

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

Output:

java programs

In this example, the insert() function is used to insert the string "programs" into the vector (vector) "v".

Example2

Let's look at a simple example.

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] << " \t ";
return 0;
}

Output:

C CC Tutorials

Example3

Let's look at a simple example.

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] << " \t ";
	return 0;
}

Output:

1　2　3　4　5　6　7　8　9　10

C++ Vector (Container)