Data Structures using C++

  #include< iostream > 
  using namespace std; 
  int main() 
  { 
     int arr[10]; 
     int no_of_elements, key; 
     bool found = false; 
     cout<<"Enter the number of element: "; 
     cin>>no_of_elements; 
     for(int i = 0; i < no_of_elements; i++) 
     { 
       cout<<"arr["<< i <<"]: "; 
       cin>>arr[i]; 
     } 
     cout<<"Enter the value to search: "; 
     cin>>key; 
     for(int i=0;i< no_of_elements;i++) 
     { 
       if(key == arr[i]) 
       { 
         found = true; 
         cout<<"The value is found at index arr["<< i <<"]"; 
       } 
     } 
     if(!found) 
     { 
       cout<<"Key not found!"; 
     } 
     return 0; 
  }