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;
}how to create a vector in c++
// First include the vector library:
#include <vector>
// The syntax to create a vector looks like this:
std::vector<type> name;
// We can create & initialize "lol" vector with specific values:
std::vector<double> lol = {66.666, -420.69};
// it would look like this: 66.666 | -420.69c++ 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;
}initialize vector of vector c++
#include <iostream>
#include <vector>
#define M 3
#define N 4
int main()
{
// specify default value to fill the vector elements
int default_value = 1;
// first initialize a vector of ints with given default value
std::vector<int> v(N, default_value);
// Use above vector to initialize the two-dimensional vector
std::vector<std::vector<int>> matrix(M, v);
return 0;
}adding element in vector c++
vector_name.push_back(element_to_be_added);vector c++
Vectors are sequence container that can change size. Container is a objects
that hold data of same type. Sequence containers store elements strictly in
linear sequence.
Vector stores elements in contiguous memory locations and enables direct access
to any element using subscript operator []. Unlike array, vector can shrink or
expand as needed at run time. The storage of the vector is handled automatically.
To support shrink and expand functionality at runtime, vector container may
allocate some extra storage to accommodate for possible growth thus container
have actual capacity greater than the size. Therefore, compared to array, vector
consumes more memory in exchange for the ability to manage storage and grow
dynamically in an efficient way.
Zero sized vectors are also valid. In that case vector.begin() and vector.end()
points to same location. But behavior of calling front() or back() is undefined.Copyright © 2021 Codeinu
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