how to create a vector in c++
// CPP program to create an empty vector
// and push values one by one.
#include <vector>
using namespace std;
int main()
{
// Create an empty vector
vector<int> vect;
//add/push an integer to the end of the vector
vect.push_back(10);
//to traverse and print the vector from start to finish
for (int x : vect)
cout << x << " ";
return 0;
}c++ vector
#include <vector>
int main() {
std::vector<int> v;
v.push_back(10); // v = [10];
v.push_back(20); // v = [10, 20];
v.pop_back(); // v = [10];
v.push_back(30); // v = [10, 30];
auto it = v.begin();
int x = *it; // x = 10;
++it;
int y = *it; // y = 30
++it;
bool is_end = it == v.end(); // is_end = true
return 0;
}c++ vector
#include <vector>
#include <string>
int main() {
std::vector<std::string> str_v;
str_v.push_back("abc");
str_v.push_back("hello world!!");
str_v.push_back("i'm a coder.");
for(auto it = str_v.beigin();it != str_v.end(); it++) {
printf("%s\n",it->c_str());
}
}c++ vector size
#include <vector>
int main() {
std::vector<int> myVector = { 666, 1337, 420 };
size_t size = myVector.size(); // 3
myVector.push_back(399); // Add 399 to the end of the vector
size = myVector.size(); // 4
}declare vectors c++
vector<int> vec;
//Creates an empty (size 0) vector
vector<int> vec(4);
//Creates a vector with 4 elements.
/*Each element is initialised to zero.
If this were a vector of strings, each
string would be empty. */
vector<int> vec(4, 42);
/*Creates a vector with 4 elements.
Each element is initialised to 42. */
vector<int> vec(4, 42);
vector<int> vec2(vec);
/*The second line creates a new vector, copying each element from the
vec into vec2. */vector in c++
vector<int> g1;
for (int i = 1; i <= 5; i++)
g1.push_back(i);
cout << "Output of begin and end: ";
for (auto i = g1.begin(); i != g1.end(); ++i)
cout << *i << " ";
cout << "\nOutput of cbegin and cend: ";
for (auto i = g1.cbegin(); i != g1.cend(); ++i)
cout << *i << " ";
cout << "\nOutput of rbegin and rend: ";
for (auto ir = g1.rbegin(); ir != g1.rend(); ++ir)
cout << *ir << " ";Copyright © 2021 Codeinu
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