#include <iostream>
int main() {
// 1. initialize
vector<int> v0;
vector<int> v1(5, 0);
// 2. make a copy
vector<int> v2(v1.begin(), v1.end());
vector<int> v3(v2);
// 2. cast an array to a vector
int a[5] = {0, 1, 2, 3, 4};
vector<int> v4(a, *(&a + 1));
// 3. get length
cout << "The size of v4 is: " << v4.size() << endl;
// 4. access element
cout << "The first element in v4 is: " << v4[0] << endl;
// 5. iterate the vector
cout << "[Version 1] The contents of v4 are:";
for (int i = 0; i < v4.size(); ++i) {
cout << " " << v4[i];
}
cout << endl;
cout << "[Version 2] The contents of v4 are:";
for (int& item : v4) {
cout << " " << item;
}
cout << endl;
cout << "[Version 3] The contents of v4 are:";
for (auto item = v4.begin(); item != v4.end(); ++item) {
cout << " " << *item;
}
cout << endl;
// 6. modify element
v4[0] = 5;
// 7. sort
sort(v4.begin(), v4.end());
// 8. add new element at the end of the vector
v4.push_back(-1);
// 9. delete the last element
v4.pop_back();
}
how to use vector in C++
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