school/cpp/8.9.3-swap-vector-ends/main.cpp

#include <iostream>
#include <vector>
using namespace std;

/* Your solution goes here  */

void SwapVectorEnds(vector<int>& v){
   int temp;
   temp = v.at(0);
   
   v.at(0) = v.at(v.size()-1);
   
   v.at(v.size()-1) = temp;
}

int main() {
   vector<int> sortVector(4);
   unsigned int i;
   int userNum;

   for (i = 0; i < sortVector.size(); ++i) {
      cin >> userNum;
      sortVector.at(i) = userNum;
   }

   SwapVectorEnds(sortVector);

   for (i = 0; i < sortVector.size(); ++i) {
      cout << sortVector.at(i) << " ";
   }
   cout << endl;

   return 0;
}