C++ concatenate two int arrays into one larger array

Question

Is there a way to take two int arrays in C++

int * arr1;
int * arr2;
//pretend that in the lines below, we fill these two arrays with different
//int values
         


        

Answer 1

Given int * arr1 and int * arr2, this program Concatenates in int * arr3 the elements of the both arrays. Unfortunately, in C++ you need to know the sizes of each arrays you want to copy. But this is no impediment to choose how many elements you want to copy from arr1 and how many from arr2.

#include 
using namespace std;

int main(){
int temp[] = {1,2,3,4};
int temp2[] = {33,55,22};
int * arr1, * arr2, *arr3;
int size1(4), size2(3); //size1 and size2 is how many elements you 
//want to copy from the first and second array. In our case all.
//arr1 = new int[size1]; // optional
//arr2 = new int[size2];

arr1=temp;
arr2=temp2;

arr3 = new int; 
//or if you know the size: arr3 = new int[size1+size2];

for(int i=0; i