Question

I’m very new to C++ and I’m trying to learn the vector in C++..

I wrote the small program as below. I like to foreach(var sal in salaries) like C# but it doesn’t allow me to do that so I googled it and found that I have to use iterator.. Im able to compile and run this program but I dont get the expected output.. I’m getting “0 0 0 0 0 0 1 2 3 4 5 6 7 8 9” instead of “0 1 2 3 4 5 6 7 8 9”..

Could anyone please explain me why? Thanks.

#include <iostream>
#include <iomanip>
#include <vector>

using namespace std;

void show(int i)
{
  cout << i << " ";
}

int main(){

    vector<int> salaries(5);

    for(int i=0; i < 10; i++){
        salaries.push_back(i);
    }

    for_each(salaries.begin(), salaries.end(), show);   
}

Answer 1

You created a vector with 5 elements, then you push 10 more onto the end. That gives you a total of 15 elements, and the results you’re seeing. Try changing your definition of the vector (in particular the constructor call), and you’ll be set. How about:

vector<int> salaries;