how to initialize a vector in c++ code example

Example 1: initialize vector of vector c++

#include 
#include 
 
#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 v(N, default_value);
  // Use above vector to initialize the two-dimensional vector
  std::vector> matrix(M, v);
  
  return 0;
}

Example 2: how to create a vector in c++

// CPP program to create an empty vector 
// and push values one by one. 
#include 

using namespace std;
int main() 
{ 
    // Create an empty vector 
    vector 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; 
}

Example 3: how to create a vector in c++

// First include the vector library:
#include 

// The syntax to create a vector looks like this:
std::vector name;

// We can create & initialize "lol" vector with specific values:
std::vector lol = {66.666, -420.69};

// it would look like this: 66.666 | -420.69

Example 4: how to initialize vector in c++ with all elements 0

vector arr(10,0);

Example 5: c++ initialize a vector

#include  
#include  
using namespace std; 
  
int main() 
{ 
// This vector initializes with the values: 10, 20, and 30
  vector vect{ 10, 20, 30 }; 

    return 0; 
}

Example 6: how to initialize a vector in c++

std::vector name;