How to use the random_shuffle() function in C++
The random_shuffle() function in C++ is used to randomly shuffle elements within a specified range.
This function is available in the <algorithm.h> header file.
Parameters
The random_shuffle() function accepts the following parameters:
first: an iterator that points to the first index of the array or vector from which we want to randomly shuffle the elements.last: an iterator that points to the last index of the array or vector until which we want to rotate the elements.gen: an optional parameter that specifies a unary function, which tells how to shuffle the elements.
Return value
The random_shuffle() function does not return any value.
Code
Let’s look at the code to understand it better.
#include <iostream>#include <vector>#include <algorithm>using namespace std;int main() {vector<int> vec = {1,2,3,4,5,6,7,8,9};random_shuffle(vec.begin(), vec.end());cout << "Updated vector: ";for (int x: vec)cout << x << " ";return 0;}
Explanation
- From lines 1 to 3, we import the required libraries.
- In line 7, we create a vector containing integer values.
- In line 9, we call the
random_shuffle()function and pass the required parameters. - Finally, from lines 11 to 13, we print the randomly shuffled vector.
In this way, we can use the random_shuffle() function to randomly shuffle elements in C++.