Last Updated : 12 Jul, 2025
The 'fill' function assigns the value 'val' to all the elements in the range [begin, end), where 'begin' is the initial position and 'end' is the last position. NOTE : Notice carefully that 'begin' is included in the range but 'end' is NOT included. Below is an example to demonstrate 'fill' :
CPP
// C++ program to demonstrate working of fill()
#include <bits/stdc++.h>
using namespace std;
int main()
{
vector<int> vect(8);
// calling fill to initialize values in the
// range to 4
fill(vect.begin() + 2, vect.end() - 1, 4);
for (int i = 0; i < vect.size(); i++)
cout << vect[i] << " ";
return 0;
}
We can also use fill to fill values in an array.
CPP
// C++ program to demonstrate working of fill()
#include <bits/stdc++.h>
using namespace std;
int main()
{
int arr[10];
// calling fill to initialize values in the
// range to 4
fill(arr, arr + 10, 4);
for (int i = 0; i < 10; i++)
cout << arr[i] << " ";
return 0;
}
Output:
4 4 4 4 4 4 4 4 4 4
Filling list in C++.
CPP
// C++ program to demonstrate working of fill()
#include <bits/stdc++.h>
using namespace std;
int main()
{
list<int> ml = { 10, 20, 30 };
fill(ml.begin(), ml.end(), 4);
for (int x : ml)
cout << x << " ";
return 0;
}
The time complexity of fill function: O(N)
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