How to write as many arrays as the user wants?

Question

for example

if
cin>>n
i want to create n arrays .

Answer 1

Use a vector to store all the arrays.

#include <iostream>
#include <vector>
#include <array>

...

constexpr unsigned ArraySize = 50;
std::vector<std::array<int, ArraySize>> v;

int numberOfArrays;
std::cin >> numberOfArrays;

for( int i = 0; i < numberOfArrays; ++i )
{
v.push_back( std::array<int, ArraySize>() );
}

Answer 2

or create a pointer, then allocate memory based on user input.

int *x, size;
cin>>size;
x = new int[size];