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  1. // Computer Programming, XB_40011, Fall 2018
  2. // Vrije Universiteit, Amsterdam
  3. //
  4. // (GRADED) Assignment 3.3 "Second smallest"
  5. //
  6. // Submit this assignment to Canvas!
  7. // By doing so you declare to comply to the regulations as stated
  8. // on the page on "Ethical behaviour and fraud" in the course's
  9. // Canvas site.
  10. //
  11. // Student name   : Mateusz Belka
  12. // Student number : 2637578
  13. // VUnet-id       : mba325
  14. //
  15. // Fill in your details above,
  16. // then enter your code below this header.
  17. //
  18. #include<iostream>
  19. #include<vector>
  20. #include<algorithm>
  21.  
  22. using namespace std;
  23.  
  24. int main()
  25. {
  26.   //Vars
  27.   vector<int> list;
  28.   int listEle;
  29.   int listEleTmp;
  30.  
  31.   //Question
  32.   cout << "Enter the numbers in random order: (close by entering q)" << endl;
  33.   //FIXME: Check the order of operations in while loop.
  34.   //FIXME: You might be able to not need the next if statement and pop_back stuff
  35.   while (!cin.fail()) //Detects if non-int is entered
  36.   {
  37.     cin >> listEle;
  38.     list.push_back(listEle);
  39.   }
  40.   if (cin.fail()) //Gets rid of unwanted non-int entrance to vector
  41.   {
  42.     cin.clear();
  43.     list.pop_back();
  44.   }
  45.  
  46.   //Sorting from lowest to highest
  47.   sort(list.begin(), list.end());
  48.  
  49.   //Check if second smallest exists
  50.   //FIXME: make sure its the best method of going about this problem
  51.   if (list.size() > 1) //inside of if statement will fail in case of list with 0 or 1 element
  52.   {
  53.     listEleTmp = list.at(0);
  54.     for (int i = 0; i < list.size() - 1; ++i)
  55.     {
  56.       if (list.at(i) != list.at(i + 1))
  57.       {
  58.         listEleTmp = list.at(i);
  59.       }
  60.     }
  61.     if (list.at(list.size() - 1 != list.at(list.size() - 2)))
  62.     {
  63.       listEleTmp = list.at(list.size() - 1);
  64.     }
  65.   }
  66.   else
  67.   {
  68.     cout << "error: no second smallest";
  69.     return 0;
  70.   }
  71.  
  72.   //Print
  73.   if (listEleTmp == list.at(0)){
  74.     cout << "error: no second smallest";
  75.   }
  76.   else
  77.   {
  78.     //FIXME: make a loop that checks for same same variables so no fake second smallest is created
  79.     if (list.at(0) == list.at(1))
  80.     {
  81.       cout << "The second smallest number is " << list.at(2);
  82.     }
  83.     else
  84.     {
  85.       cout << "The second smallest number is " << list.at(1);
  86.     }
  87.   }
  88.   return 0;
  89. }
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