Question

How to push an element onto the front of deque in C++

Answer 1

#include <iostream> 
#include <deque> 

int main() 
{ 
    std::deque<double> dq = {3.14, 2.18, 4.19, 6.17, 8.27, 5.28}; 

    dq.push_front(7.26);
    
    for (unsigned int i = 0; i < dq.size(); i++) 
        std::cout << dq[i] << ' '; 
}

      
      
      
/*
run:
      
7.26 3.14 2.18 4.19 6.17 8.27 5.28 
  
*/

 

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