Question

How to print every second element of a vector in C++

Answer 1

#include <iostream>
#include <vector>
 
using std::vector;
using std::cout;
using std::endl;
 
int main()
{
    vector<int> vec{ 1, 3, 8, 23, 99, 12, 100, 7 };
     
    for (int i = 1; i < vec.size(); i += 2) {
        cout << vec.begin()[i] << ' ';
    }
    
    cout << endl;
}
 
 
/*
run:
 
3 23 12 7 
 
*/

 

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Answer 2

#include <iostream>
#include <vector>
 
using std::vector;
using std::cout;
using std::endl;
 
int main()
{
    vector<int> vec{ 1, 3, 8, 23, 99, 12, 100, 7 };
     
    vector<int>::iterator pos;
    for (pos = vec.begin() + 1; pos < vec.end(); pos += 2) {
        cout << *pos << ' ';
    }

    cout << endl;
}
 
 
/*
run:
 
3 23 12 7 
 
*/

 

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