How to add element to C++ array?

Question

I want to add an int into an array, but the problem is that I don't know what the index is now.

int[] arr = new int[15]; arr[0] = 1; arr[1] = 2; arr[2] = 3; arr[3] = 4; arr[4] = 5; 

That code works because I know what index I am assigning to, but what if I don't know the index...

In PHP, I can just do arr[]=22;, which will automatically add 22 to the next empty index of the array. But in C++ I can't do that, it gives me a compiler error. What do you guys suggest?

Answer 1

There is no way to do what you say in C++ with plain arrays. The C++ solution for that is by using the STL library that gives you the std::vector.

You can use a vector in this way:

#include <vector>  std::vector< int > arr;  arr.push_back(1); arr.push_back(2); arr.push_back(3);