Question: Hi guys i am new to c++, I just wrote this code to find min/max of a array of numbers.  

I just want to know how can I make the no. of entries flexible(I mean the user should be able to enter as many entries as possible without specifying how many in the starting)

Here's the code, but its not working, can someone please help?
Thanks
code:

```
#include <iostream>
using namespace std;
int main(){

    cout<<"Program to calculate max/min/second max\n";
    int *A;
    A=new int[5];
    bool flag=false;
    int x=0,i=0;
    cout<<"Enter the numbers\n";

    do{

        cin>>x;
        if(x=='\0'){
            flag=true;
        }
        *(A+i)=x;
        i++;

    }
    while(!flag);

    for(int j=0;j<i;j++){

        cout<<*(A+j)<<"\n";

    }

    return 0;
}

```

Answer: 
You are confused that pressing enter will just give you the null terminator. It will not. Depending on your platform it will give you a carriage return/line-feed (`\r\n` in Win, `\n` in \*ix). The best way to do this is to just have them use a letter like 'q' for quit or a number like -1, and then compare on that.
You will have to use some sort of variable length datastructure and Vector is the best choice for this since you are working in C++. Therefore, instead of your fixed length array:

```
int *A;
A=new int[5];

```

use a vector like this:

```
std::vector<int> input;

```

And then to add values to this, use the following:

```
input.push_back(10);

```

[There is an example on this page about using vectors.](http://www.cplusplus.com/reference/stl/vector/insert/)