std::advance advances the iterator ‘it’ by n element positions.
Syntax :
template void advance (InputIterator& it, Distance n); it : Iterator to be advanced n : Number of element positions to advance. This shall only be negative for random-access and bidirectional iterators. Return type : None.
Motivation problem : A vector container is given. Task is to print alternate elements.
Examples :
Input : 10 40 20 50 80 70 Output : 10 20 80
// C++ program to illustrate // using std::advance #include <bits/stdc++.h> // Driver code int main() { // Vector container std::vector< int > vec; // Initialising vector for ( int i = 0; i < 10; i++) vec.push_back(i * 10); // Printing the vector elements for ( int i = 0; i < 10; i++) { std::cout << vec[i] << " " ; } std::cout << std::endl; // Declaring the vector iterator std::vector< int >::iterator it = vec.begin(); // Printing alternate elements while (it < vec.end()) { std::cout << *it << " " ; std::advance(it, 2); } } |
Output:
0 10 20 30 40 50 60 70 80 90 0 20 40 60 80
This article is contributed by Rohit Thapliyal. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.
Attention reader! Don’t stop learning now. Get hold of all the important C++ Foundation and STL concepts with the C++ Foundation and STL courses at a student-friendly price and become industry ready.