how to find vector size in cpp

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Aggressive Albatross answered on May 16, 2020 Popularity 9/10 Helpfulness 3/10

answer how to find vector size in cpp

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how to find vector size in cpp

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#include <iostream>
#include <vector>
using namespace std;

int main()
{
    vector<int> a(8, 57);
    a.push_back(371);   // Adds 371 at the end
    a.pop_back();       // Removes the last element
    a.resize(14, -25);  // Increases the size to 14, adding -25
    a.resize(7, -25);   // Reduces the size by 1 element
    a.assign(10, 23);   // Clears the previous vector and adds 10 elements with the value 23
    bool f = a.empty(); // Checks if the vector is empty
    a.clear();          // Makes the vector empty
    int x = a.back();   // Returns the last element
    a.back() = 2;       // Sets the last element to 2
    x = a.front();      // Reference to the first element of the vector
    a.front() += 4;     // Increases the first element by 4
    return 0;
}

Popularity 9/10 Helpfulness 3/10 Language cpp

Source: Grepper

Tags: c++ find size vector

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Contributed on Jul 05 2023

Aggressive Albatross

0 Answers Avg Quality 2/10

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c++ vector size

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#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
}

Popularity 10/10 Helpfulness 4/10 Language cpp

Source: Grepper

Tags: c++

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Contributed on May 16 2020

Bright Badger

0 Answers Avg Quality 2/10

find vector size in c++

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vectorName.size();

Popularity 10/10 Helpfulness 2/10 Language cpp

Source: Grepper

Tags: c++

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Contributed on Mar 12 2021

Vivacious Vole

0 Answers Avg Quality 2/10

finding the size of vector in c++

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vector<int> a;
//to directly find the size of the vector;
//use  a.size(;

cout <<" " << a.size();

Popularity 10/10 Helpfulness 2/10 Language cpp

Source: Grepper

Tags: c++

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Contributed on Jan 16 2021

Codevar

0 Answers Avg Quality 2/10

vector size c++

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size() function is used to return the size of the vector container or the number of elements in the vector container.
using namespace std;
int main(){
    vector<int> myvector{ 1, 2, 3, 4, 5 };
    cout << myvector.size();
    return 0;
}
//Output = 5

Popularity 10/10 Helpfulness 1/10 Language cpp

Source: Grepper

Tags: c++

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Contributed on Apr 13 2022

Sleepy Head

0 Answers Avg Quality 2/10

c++ create vector of size

Comment

-1

// create a vector with 20 integer elements
std::vector<int> arr(20);

for(int x = 0; x < 20; ++x)
   arr[x] = x;

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Source: stackoverflow.com

Tags: c++

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Contributed on Jul 15 2020

Wrong Weasel

0 Answers Avg Quality 2/10

std::vector size of

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// vector::size
#include <iostream>
#include <vector>

int main ()
{
  std::vector<int> myints;
  std::cout << "0. size: " << myints.size() << '\n';

  for (int i=0; i<10; i++) myints.push_back(i);
  std::cout << "1. size: " << myints.size() << '\n';

  myints.insert (myints.end(),10,100);
  std::cout << "2. size: " << myints.size() << '\n';

  myints.pop_back();
  std::cout << "3. size: " << myints.size() << '\n';

  return 0;
}

Popularity 7/10 Helpfulness 1/10 Language cpp

Source: cplusplus.com

Tags: c++ size

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Contributed on Feb 27 2024

Pierre Alla

0 Answers Avg Quality 2/10

how to find vector size in cpp

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