Skip to content
Related Articles

Related Articles

deque resize() function in C++ STL
  • Difficulty Level : Basic
  • Last Updated : 30 Aug, 2018

The deque::resize() is an inbuilt function in C++ STL which changes the size of the deque.
If the given size is greater than the current size, then new elements are inserted at the end of the deque.
If the given size is smaller than the current size, then extra elements are destroyed.

Syntax:

deque_name.resize(n)

Parameter: The function accepts only one mandatory parameter n which specifies the size of the deque.

Return value: The function does not return anything.

Below program illustrates the above function:



Program 1:




// C++ program to illustrate the
// deque::resize() function
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
    deque<int> dq = { 10, 20, 30, 40, 50 };
  
    cout << "Size before resize " << dq.size() << "\n";
  
    // Prints the deque elements
    cout << "The contents of deque :";
    for (auto it = dq.begin(); it != dq.end(); ++it)
        cout << *it << " ";
  
    cout << endl;
  
    // resize to 7
    dq.resize(7);
  
    // // Prints the deque elements after resize()
    cout << "Size after resize " << dq.size() << "\n";
  
    cout << "The contents of deque :";
    for (auto it = dq.begin(); it != dq.end(); ++it)
        cout << *it << " ";
  
    return 0;
}


Output:

Size before resize 5
The contents of deque :10 20 30 40 50 
Size after resize 7
The contents of deque :10 20 30 40 50 0 0

Program 2:




// C++ program to illustrate the
// deque::resize() function
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
    deque<int> dq = { 10, 20, 30, 40, 50 };
  
    cout << "Size before resize " << dq.size() << "\n";
  
    // Prints the deque elements
    cout << "The contents of deque :";
    for (auto it = dq.begin(); it != dq.end(); ++it)
        cout << *it << " ";
  
    cout << endl;
  
    // resize to 3
    dq.resize(3);
  
    cout << "Size after resize " << dq.size() << "\n";
  
    cout << "The contents of deque :";
    for (auto it = dq.begin(); it != dq.end(); ++it)
        cout << *it << " ";
  
    return 0;
}


Output:

Size before resize 5
The contents of deque :10 20 30 40 50 
Size after resize 3
The contents of deque :10 20 30

Time Complexity: O(N)

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.

My Personal Notes arrow_drop_up
Recommended Articles
Page :