C++ <list> back function
backis used in list toget the last elementof the function.
backIs a member function of the container class, used to return the last element of the linked list.
The time complexity is O(1).
Word Definitions： backMeans "back", i.e., obtains the last element.
Basic syntax and parameters
Syntax format
reference back(); const_reference back() const;
Function description
- Return Value: Returns a reference to the last element.
- Note: The linked list must not be empty.
Example
Example 1: Get the last element
Example
#include <iostream>
#include <list>
int main() {
std::list<int> numbers = {10, 20, 30, 40, 50};
std::cout << "Last element: " << numbers.back() << std::endl;
// Modify the last element
numbers.back() = 100;
std::cout << "Last element after modification: " << numbers.back() << std::endl;
return 0;
}
#include <list>
int main() {
std::list<int> numbers = {10, 20, 30, 40, 50};
std::cout << "Last element: " << numbers.back() << std::endl;
// Modify the last element
numbers.back() = 100;
std::cout << "Last element after modification: " << numbers.back() << std::endl;
return 0;
}
Expected running result:
最后一个元素: 50 修改后最后一个元素: 100
other extensions