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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. using namespace std;
  5.  
  6. int main() {
  7.     // Creating empty vector containing integers
  8.     vector<int> array;
  9.     // Creating vector containing 10 elements of type integer with default value for that type - 0
  10.     vector<int> array2(10);
  11.  
  12.     cout << "Element 0 of array2 is: " << array2[0] << endl;
  13.  
  14.     // Creating vector containing 10 elements of type integer with value 23
  15.     vector<int> array3(10, 23);
  16.  
  17.     cout << "Element 0 of array3 is: " << array3[0] << endl;
  18.  
  19.     // We can also achieve similar behaviour by setting value for existing variable
  20.     array = vector<int>(10, 23);
  21.     cout << "Element 0 of array is: " << array[0] << endl;
  22.  
  23.     // Checking size of the array
  24.     cout << "Size of the array is: " << array.size() << endl;
  25.  
  26.     // Adding new element to the end of the array
  27.     array.push_back(55);
  28.     cout << "Last element of array is: " << array[array.size() - 1] << endl;
  29.     cout << "Size of the array is: " << array.size() << endl;
  30.  
  31.     // Adding new element at the position 5 in the array
  32.     array.insert(array.begin() + 5, 60);
  33.     cout << "Element 5 of array is: " << array[5] << endl;
  34.     cout << "Size of the array is: " << array.size() << endl;
  35.  
  36.     // Deleting last element in the array
  37.     array.pop_back();
  38.     cout << "Size of the array is: " << array.size() << endl;
  39.  
  40.     // Deleting element at the position 5
  41.     array.erase(array.begin() + 5);
  42.     cout << "Element 5 of array is: " << array[5] << endl;
  43.     cout << "Size of the array is: " << array.size() << endl;
  44.  
  45.     // Deleting elements in the array from index 5 to 7, not including 7
  46.     array.erase(array.begin() + 5, array.begin() + 7);
  47.     cout << "Size of the array is: " << array.size() << endl;
  48.  
  49.     // Resizing array to size 20, filling new elements with default value
  50.     array.resize(20);
  51.     cout << "Element 19 of the array is: " << array[19] << endl;
  52.     cout << "Size of the array is: " << array.size() << endl;
  53.  
  54.     // Resizing array to size 30, filling new elements with the value 41
  55.     array.resize(30, 41);
  56.     cout << "Element 29 of the array is: " << array[29] << endl;
  57.     cout << "Size of the array is: " << array.size() << endl;
  58.  
  59.     // Checking if the array is empty
  60.     if(array.empty()) {
  61.         cout << "Array is empty" << endl;
  62.     } else {
  63.         cout << "Array is not empty" << endl;
  64.     }
  65.  
  66.     cout << "Content of the array: ";
  67.     // Printing content of the array
  68.     for(auto el: array) {
  69.         cout << el << " ";
  70.     }
  71.  
  72.     cout << endl;
  73.  
  74.     // Clearing array removing all of its content
  75.     array.clear();
  76.     cout << "Size of the array is: " << array.size() << endl;
  77.  
  78.     return 0;
  79. }
Success #stdin #stdout 0s 5644KB
comments (?)
stdin 
Standard input is empty
stdout 
Element 0 of array2 is: 0
Element 0 of array3 is: 23
Element 0 of array is: 23
Size of the array is: 10
Last element of array is: 55
Size of the array is: 11
Element 5 of array is: 60
Size of the array is: 12
Size of the array is: 11
Element 5 of array is: 23
Size of the array is: 10
Size of the array is: 8
Element 19 of the array is: 0
Size of the array is: 20
Element 29 of the array is: 41
Size of the array is: 30
Array is not empty
Content of the array: 23 23 23 23 23 23 23 23 0 0 0 0 0 0 0 0 0 0 0 0 41 41 41 41 41 41 41 41 41 41 
Size of the array is: 0
https://ideone.com/6qwyfQ
Vector example
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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