Chương trình C ++ để triển khai Vector trong STL

Các vectơ có khả năng tự động thay đổi kích thước giống như các mảng động khi một phần tử được chèn hoặc xóa, vùng chứa sẽ tự động xử lý việc lưu trữ của chúng. Các phần tử vectơ được đặt trong bộ lưu trữ liền kề để chúng có thể được truy cập và duyệt qua bằng trình vòng lặp. Dữ liệu có thể được chèn hoặc xóa ở đầu, giữa hoặc cuối của vectơ.

Chức năng và mô tả:

List of functions used here:
   v.size() = Returns the size of vector.
   v.push_back() = It is used to insert elements to the vector from end.
   v.pop_back() = To pop out the value from the vector from back.
   v.capacity() = Returns the size of the storage space currently allocated to the vector as number of elements.
   v.clear() = Clears the vector.

Mã mẫu

#include <iostream>
#include <vector>
using namespace std;
int main() {
   vector<int> v;
   vector<int>::iterator it;
   int c, i;
   while (1) {
      cout<<"1.Size of the Vector"<<endl;
      cout<<"2.Insert Element into the Vector"<<endl;
      cout<<"3.Delete Last Element of the Vector"<<endl;
      cout<<"4.Display the capacity of vector"<<endl;
      cout<<"5.Display by Iterator"<<endl;
      cout<<"6.Clear the Vector"<<endl;
      cout<<"7.Exit"<<endl;
      cout<<"Enter your Choice: ";
      cin>>c;
      switch(c) {
         case 1:
            cout<<"Size of Vector: ";
            cout<<v.size()<<endl;
         break;
         case 2:
            cout<<"Enter value to be inserted: ";
            cin>>i;
            v.push_back(i);
         break;
         case 3:
            cout<<"Delete Last Element Inserted:"<<endl;
            v.pop_back();
         break;
         case 4:
            cout<<"Displaying capacity of vector: ";
            cout<<v.capacity()<<endl;
         break;
         case 5:
            cout<<"Displaying Vector by Iterator: ";
            for (it = v.begin(); it != v.end(); it++) {
               cout<<*it<<" ";
            }
            cout<<endl;
         break;
         case 6:
            v.clear();
            cout<<"Vector Cleared"<<endl;
         break;
         case 7:
            exit(1);
         break;
         default:
            cout<<"Wrong Choice"<<endl;
      }
   }
   return 0;
}

Đầu ra

1.Size of the Vector
2.Insert Element into the Vector
3.Delete Last Element of the Vector
4.Display the capacity of vector
5.Display by Iterator
6.Clear the Vector
7.Exit
Enter your Choice: 1
Size of Vector: 0
1.Size of the Vector
2.Insert Element into the Vector
3.Delete Last Element of the Vector
4.Display the capacity of vector
5.Display by Iterator
6.Clear the Vector
7.Exit
Enter your Choice: 2
Enter value to be inserted: 7
1.Size of the Vector
2.Insert Element into the Vector
3.Delete Last Element of the Vector
4.Display the capacity of vector
5.Display by Iterator
6.Clear the Vector
7.Exit
Enter your Choice: 2
Enter value to be inserted: 6
1.Size of the Vector
2.Insert Element into the Vector
3.Delete Last Element of the Vector
4.Display the capacity of vector
5.Display by Iterator
6.Clear the Vector
7.Exit
Enter your Choice: 2
Enter value to be inserted: 4
1.Size of the Vector
2.Insert Element into the Vector
3.Delete Last Element of the Vector
4.Display the capacity of vector
5.Display by Iterator
6.Clear the Vector
7.Exit
Enter your Choice: 2
Enter value to be inserted: 3
1.Size of the Vector
2.Insert Element into the Vector
3.Delete Last Element of the Vector
4.Display the capacity of vector
5.Display by Iterator
6.Clear the Vector
7.Exit
Enter your Choice: 2
Enter value to be inserted: 5
1.Size of the Vector
2.Insert Element into the Vector
3.Delete Last Element of the Vector
4.Display the capacity of vector
5.Display by Iterator
6.Clear the Vector
7.Exit
Enter your Choice: 4
Displaying capacity of vector: 8
1.Size of the Vector
2.Insert Element into the Vector
3.Delete Last Element of the Vector
4.Display the capacity of vector
5.Display by Iterator
6.Clear the Vector
7.Exit
Enter your Choice: 5
Displaying Vector by Iterator: 7 6 4 3 5
1.Size of the Vector
2.Insert Element into the Vector
3.Delete Last Element of the Vector
4.Display the capacity of vector
5.Display by Iterator
6.Clear the Vector
7.Exit
Enter your Choice: 3
Delete Last Element Inserted:
1.Size of the Vector
2.Insert Element into the Vector
3.Delete Last Element of the Vector
4.Display the capacity of vector
5.Display by Iterator
6.Clear the Vector
7.Exit
Enter your Choice: 5
Displaying Vector by Iterator: 7 6 4 3
1.Size of the Vector
2.Insert Element into the Vector
3.Delete Last Element of the Vector
4.Display the capacity of vector
5.Display by Iterator
6.Clear the Vector
7.Exit
Enter your Choice: 6
Vector Cleared
1.Size of the Vector
2.Insert Element into the Vector
3.Delete Last Element of the Vector
4.Display the capacity of vector
5.Display by Iterator
6.Clear the Vector
7.Exit
Enter your Choice: 7
Exit.