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Replaces n elements with a given value
Key Facts
Gyroscopic Couple: The rate of change of angular momentum (= Moment of Inertia.
= Angular velocity
= Angular velocity of precession.
Blaise Pascal (1623-1662) was a French mathematician, physicist, inventor, writer and Catholic philosopher.
Leonhard Euler (1707-1783) was a pioneering Swiss mathematician and physicist.
Definition
The fill_n() algorithm is defined in the standard header <algorithm> and in the nonstandard backward-compatibility header <algo.h>.Interface
#include <algorithm> template < class OutputIterator, class Size, class Type > void fill_n( OutputIterator first, Size count, const Type& val );Parameters:
| Parameter | Description |
|---|---|
| first | An output iterator addressing the position of the first element in the range to be assigned the value val |
| count | A signed or unsigned integer type specifying the number of elements to be assigned the value |
| val | The value to be assigned to elements in the range [first, first + count) |
References
Example:
Example - fill_n function
Problem
The following program demonstrates how to use fill_n() function.
Workings
#include <vector> #include <algorithm> #include <iostream> using namespace std; int main() { vector <int> vec; vector <int>::iterator Iter1; int i; for (i = 10; i <= 20; i++) vec.push_back(i); cout <<"Vector vec data: "; for (Iter1 = vec.begin(); Iter1 != vec.end(); Iter1++) cout <<*Iter1<<" "; cout <<endl; // fill the last 3 positions for 6 position with a value of 9 cout <<"\nOperation: fill_n(vec.begin() + 3, 6, 9)\n"; fill_n(vec.begin() + 3, 6, 9); cout <<"Modified vec data: "; for (Iter1 = vec.begin(); Iter1 != vec.end(); Iter1++) cout <<*Iter1<<" "; cout <<endl; return 0; }
Solution
Output:
Vector vec data: 10 11 12 13 14 15 16 17 18 19 20
Operation: fill_n(vec.begin() + 3, 6, 9)
Modified vec data: 10 11 12 9 9 9 9 9 9 19 20
Operation: fill_n(vec.begin() + 3, 6, 9)
Modified vec data: 10 11 12 9 9 9 9 9 9 19 20
References