Check out example codes for "vector initialization c++". It will help you in understanding the concepts better.

Code Example 1

// 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 | -420.69

Code Example 2

// CPP program to initialize a vector from 
// another vector. 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    vector<int> vect1{ 10, 20, 30 }; 
  
    vector<int> vect2(vect1.begin(), vect1.end()); 
  
    for (int x : vect2) 
        cout << x << " "; 
  
    return 0; 
}

Code Example 3

// CPP program to create an empty vector 
// and push values one by one. 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    // Create an empty vector 
    vector<int> vect;  
     
    vect.push_back(10); 
    vect.push_back(20); 
    vect.push_back(30); 
  
    for (int x : vect) 
        cout << x << " "; 
  
    return 0; 
}

Code Example 4

vector<int> arr(10,0);

Code Example 5

// CPP program to create an empty vector 
// and push values one by one. 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    int n = 3; 
  
    // Create a vector of size n with 
    // all values as 10. 
    vector<int> vect(n, 10); 
  
    for (int x : vect) 
        cout << x << " "; 
  
    return 0; 
}

Code Example 6

//Note: any data type can be used in template.
std::vector<typename T> vectorName;

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