Styjun

Let's say I have these 10 previously declared arrays in my code.

 int arr1[] = 1,2,3,4,5,6,7,8,9,10;
 int arr2[] = 1,2,3,4,5,6,7,8,9,10;
 int arr3[] = 1,2,3,4,5,6,7,8,9,10;
 int arr4[] = 1,2,3,4,5,6,7,8,9,10;
 int arr5[] = 1,2,3,4,5,6,7,8,9,10;
 int arr6[] = 1,2,3,4,5,6,7,8,9,10;
 int arr7[] = 1,2,3,4,5,6,7,8,9,10;
 int arr8[] = 1,2,3,4,5,6,7,8,9,10;
 int arr9[] = 1,2,3,4,5,6,7,8,9,10;
 int arr10[] = 1,2,3,4,5,6,7,8,9,10;

Basically, I want to append all 10 of these arrays one after another to make one single array.

 ArrayOfArrays = arr1[], arr2[], arr3[], arr4[], arr5[], arr6[], arr7[], arr8[], arr9[], arr10[] 

How would I go about doing this? This question might seem trivial for some, but I'm new to C++ and can not figure out how to do it. Please help and thanks in advance.

Basically, I want to append all 10 of these arrays one after another to make one single array.

You cannot do that.

The closest you can get to that is by using std::array.

std::array<int, 10> arr1 = 1,2,3,4,5,6,7,8,9,10;
...
std::array<int, 10> arr10 = 1,2,3,4,5,6,7,8,9,10;

std::array<std::array<int, 10>, 10> arrayOfArray = arr1, ..., arr10;

I want to append all 10 of these arrays one after another to make one
single array ?

You can have array of pointers like

int *ArrayOfPointers[10] = &arr1, &arr2, &arr3, &arr4, &arr5, &arr6, &arr7, &arr8, &arr9, &arr10;

Here ArrayOfPointers is array of 10 int pointers i.e it can store address of 10 one dimension int array like arr1, arr2 etc.

I assume there may be better method than what I'm suggesting in advance C++ for the same task.

Try this approach:

#include <iostream>
#include <vector>

int arr1[] = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ;
int arr2[] = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ;
// ...other arrays here...

// We pass a reference to a vector and return the same vector for performance reasons.
// Compiler often can optimize that into a better code.
std::vector<int> append(std::vector<int> & vec, int * data, int size)

 for (int i = 0; i < size; ++i)
 vec.push_back(data[i]);
 return vec;


int main()

 std::vector<int> data;

 data = append(data, arr1, 10);
 data = append(data, arr2, 10);

 for (auto i : data)
 std::cout << i << ", ";
 std::cout << std::endl;
 return 0;

Also, in C++ there are good containers for storing arrays, try searching for std::array and std::vector containers. First is a fixed size static array, the other one is dynamic.

In C++ it is unnecessary and ill-advised to use C-style arrays. For arrays of
constant size you may use std::array
and for arrays of variable size, std::vector

It looks rather as if what you actually want is a constant two-dimensional matrix
and to be able to access each of its rows as as a constant array, but do not
know how to initialise a two-dimensional matrix. If that's the case, here's how:

#include <iostream>
#include <array>

std::array<std::array<int,10>,10> matrix = 
 1,2,3,4,5,6,7,8,9,10,
 1,2,3,4,5,6,7,8,9,10,
 1,2,3,4,5,6,7,8,9,10,
 1,2,3,4,5,6,7,8,9,10,
 1,2,3,4,5,6,7,8,9,10,
 1,2,3,4,5,6,7,8,9,10,
 1,2,3,4,5,6,7,8,9,10,
 1,2,3,4,5,6,7,8,9,10,
 1,2,3,4,5,6,7,8,9,10,
 1,2,3,4,5,6,7,8,9,10
;

int main()

 std::array<int,10> const & arr0 = matrix[0];
 for (int const & i : arr0) 
 std::cout << i << ' ';
 
 std::cout << std::endl;

 // Or more simply...
 auto const & arr5 = matrix[5];
 for (auto const & i : arr5) 
 std::cout << i << ' ';
 
 std::cout << std::endl;

Compile, link and run:

$ g++ -Wall -Wextra main.cpp && ./a.out
1 2 3 4 5 6 7 8 9 10 
1 2 3 4 5 6 7 8 9 10 

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