Appending a vector to a vector in C++
Input:
vector<int> v1{ 10, 20, 30, 40, 50 };
vector<int> v2{ 100, 200, 300, 400 };
//appending elements of vector v2 to vector v1
v1.insert(v1.end(), v2.begin(), v2.end());
Output:
v1: 10 20 30 40 50 100 200 300 400
v2: 100 200 300 400insert vector
#include <iostream>
#include <vector>
void print_vec(const std::vector<int>& vec)
{
for (auto x: vec) {
std::cout << ' ' << x;
}
std::cout << '\n';
}
int main ()
{
std::vector<int> vec(3,100);
print_vec(vec);
auto it = vec.begin();
it = vec.insert(it, 200);
print_vec(vec);
vec.insert(it,2,300);
print_vec(vec);
// "it" no longer valid, get a new one:
it = vec.begin();
std::vector<int> vec2(2,400);
vec.insert(it+2, vec2.begin(), vec2.end());
print_vec(vec);
int arr[] = { 501,502,503 };
vec.insert(vec.begin(), arr, arr+3);
print_vec(vec);
}Copyright © 2021 Codeinu
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