vector::begin() 함수는 컨테이너의 첫 번째 요소를 가리키는 반복자를 반환하는 데 사용되는 양방향 반복자입니다.
vector::end() 함수는 컨테이너의 마지막 요소를 가리키는 반복자를 반환하는 데 사용되는 양방향 반복자입니다.
알고리즘
Begin Initialize the vector v. Declare the vector v1 and iterator it to the vector. Insert the elements of the vector. Print the elements. End.
예시 코드
#include<iostream>
#include <bits/stdc++.h>
using namespace std;
int main() {
vector<int> v = { 50,60,70,80,90}, v1; //declaring v(with values), v1 as vector.
vector<int>::iterator it;
//declaring an ierator
it = v.insert(v.begin(), 40);
//inserting a value in v vector with specified the position at the beginning using the function begin().
it = v.insert(v.begin(), 1, 30);
//inserting a value with its size in v vector with specified the position at the beginning using the function begin().
cout << "The vector1 elements are: ";
for ( it = v.begin(); it != v.end(); ++it)
cout << *it << " "<<endl; // printing the values of v vector
v1.insert(v1.begin(),v.begin(),v.end());
//inserting all values from beginning to end, by using begin() and end() function, of v
vector in v1 vector pointing at the beginning using begin() function.
cout << "The vector2 elements are: ";
for (it = v1.begin(); it != v1.end(); ++it)
cout << *it << " "<<endl; // printing the values of v1 vector
return 0;
} 출력
The vector1 elements are: 30 40 50 60 70 80 90 The vector2 elements are: 30 40 50 60 70 80 90