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  1. //
  2. //  main.cpp
  3. //  Vector (STL)
  4. //
  5. //  Created by Himanshu on 23/09/21.
  6. //
  7.  
  8. #include <iostream>
  9. #include <vector>
  10. #include <algorithm>
  11. using namespace std;
  12.  
  13. void printIntVector (vector<int> l) {
  14.     vector<int>::iterator it;
  15.     for (it = l.begin(); it != l.end(); it++) {
  16.         cout<<(*it)<<" ";
  17.     }
  18.     cout<<endl;
  19. }
  20.  
  21. void printFloatVector (vector<float> l) {
  22.     vector<float>::iterator it;
  23.     for (it = l.begin(); it != l.end(); it++) {
  24.         cout<<(*it)<<" ";
  25.     }
  26.     cout<<endl;
  27. }
  28.  
  29. int main () {
  30.  
  31.     // Declaration
  32.     vector<float> first, second;
  33.  
  34.     // Initialisation
  35.     vector<int> vectorFirst({10, 20, 15});
  36.  
  37.     // vectorSecond is intialised with 3 ints
  38.     // having value as 45
  39.     vector<int> vectorSecond(3, 45);
  40.  
  41.     cout<<"vectorFirst elements:"<<endl;
  42.     printIntVector(vectorFirst);
  43.  
  44.     cout<<"vectorSecond elements:"<<endl;
  45.     printIntVector(vectorSecond);
  46.  
  47.     int arr[3] = {100, 101, 102};
  48.     vector<int> vectorThird;
  49.  
  50.     vectorThird.insert(vectorThird.begin(), arr, arr+3);
  51.  
  52.     cout<<"vectorThird elements after initialisation using arr:"<<endl;
  53.     printIntVector(vectorThird);
  54.     cout<<endl;
  55.  
  56.  
  57.     cout<<"vectorFirst first element: "<<vectorFirst.front()<<endl;
  58.     cout<<"vectorFirst last element: "<<vectorFirst.back()<<endl;
  59.  
  60.  
  61.     vector<int>::iterator it;
  62.  
  63.     //Iterator to vector's first element
  64.     it = vectorFirst.begin();
  65.     //insert() returns pointer to the (new) first element
  66.     it = vectorFirst.insert (it, 2);
  67.  
  68.     cout<<"vectorFirst elements after adding 2 at position (it):"<<endl;
  69.     printIntVector(vectorFirst);
  70.  
  71.     //Iterator to 3rd element after vectorFirst.begin()
  72.     vectorFirst.insert (it+3, 2, 300);
  73.  
  74.     cout<<"vectorFirst elements after adding 2 elements (value: 300) at position (it+3):"<<endl;
  75.     printIntVector(vectorFirst);
  76.  
  77.  
  78.  
  79.     vectorFirst.swap(vectorSecond);
  80.  
  81.     cout<<"vectorFirst elements after swap:"<<endl;
  82.     printIntVector(vectorFirst);
  83.     cout<<"vectorSecond elements after swap:"<<endl;
  84.     printIntVector(vectorSecond);
  85.  
  86.     vectorFirst.clear();
  87.     cout<<"vectorFirst elements after clear:"<<endl;
  88.     printIntVector(vectorFirst);
  89.  
  90.     if (vectorFirst.empty()) {
  91.         cout<<"vectorFirst is empty"<<endl;
  92.     }
  93.  
  94.     // push_back – adds a new element
  95.     // at the end of the vector
  96.     first.push_back (1.0);
  97.     first.push_back (2.0);
  98.     first.push_back (3.0);
  99.     first.push_back (4.0);
  100.     first.push_back (5.0);
  101.     first.push_back (6.0);
  102.  
  103.  
  104.     cout<<"first vector elements after push_back():"<<endl;
  105.     printFloatVector(first);
  106.  
  107.  
  108.     cout<<"first vector elements after pop_back():"<<endl;
  109.     first.pop_back();
  110.     printFloatVector(first);
  111.  
  112.  
  113.     // erase – removes either a single element (position)
  114.     // or a range of elements ([first,last))
  115.     first.erase(first.begin() + 1, first.end() - 2);
  116.  
  117.     cout<<"first vector elements after removing the elements fromm 1 to 4"<<endl;
  118.     printFloatVector(first);
  119.  
  120.     return 0;
  121. }
  122.  
Success #stdin #stdout 0.01s 5484KB
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stdin
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Standard input is empty
stdout
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vectorFirst elements:
10 20 15 
vectorSecond elements:
45 45 45 
vectorThird elements after initialisation using arr:
100 101 102 

vectorFirst first element: 10
vectorFirst last element: 15
vectorFirst elements after adding 2 at position (it):
2 10 20 15 
vectorFirst elements after adding 2 elements (value: 300) at position (it+3):
2 10 20 300 300 15 
vectorFirst elements after swap:
45 45 45 
vectorSecond elements after swap:
2 10 20 300 300 15 
vectorFirst elements after clear:

vectorFirst is empty
first vector elements after push_back():
1 2 3 4 5 6 
first vector elements after pop_back():
1 2 3 4 5 
first vector elements after removing the elements fromm 1 to 4
1 4 5
https://ideone.com/2VKGaG
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
secret

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