Use iterators to go through a data structure. Use a loop to read in some number

Question

Use iterators to go through a data structure. Use a loop to read in some number of integers into a vector. Once you have populated the vector with integers, use two iterators

to compare the first and last elements, followed by the comparison of the second and second-to-last, and so on. Make sure to use the iterator libary #include <iterator>

bash-4.1 /iterator Enter an integer (-1 to exit) 10 Enter an integer (-1 to exit) 15 Enter an integer (-1 to exit) 20 Enter an integer (-1 to exit) 20 Enter an integer (-1 to exit) 10 Enter an integer (-1 to exit) 10 Enter an integer (-1 to exit) -1 front: 10 back:10 are equal. front:15 back:10 are not equal front: 20 back:20 are equal. -bash-4.1$

Explanation / Answer

Your Program :

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

std :: vector<int> myvector ; //vector of intrger

int main() {
    int input;
   while(input!=-1){
           cout << "Enter an integer (-1 to exit) :" << endl;
           if(input == -1){break;}
           cin >> input;            //taking input from user into vector
           myvector.push_back(input); //pushing the input to vector
   }
  
   vector<int>::iterator it; //initialize iterator
   int n = myvector[myvector.size()-2];
   int i=0; //counter
      
   for(it=myvector.begin() ; it < myvector.end()-2; it++,i++){
        if(*it == n){       //comparision of elements
               cout << "front : " << *it << " " << "and back : " << n << " " << "are equal" << endl;
        }
        else{
            cout << "front : " << *it << " " << "and back : " << n << " " << "are not equal" << endl;
        }
   }
   return 0;
}

Output :

Enter an integer (-1 to exit) : 1

Enter an integer (-1 to exit) : 10

Enter an integer (-1 to exit) : 20

Enter an integer (-1 to exit) : 20

Enter an integer (-1 to exit) : 10

Enter an integer (-1 to exit) : 20

Enter an integer (-1 to exit) : -1

front : 1 and back: 20 are not equal

front : 10 and back: 20 are not equal

front : 20 and back: 20 are equal

Related Questions

Navigate

• Browse (All)
• Browse U
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.