Question

How to declare, initialize and print two dimensional (2D) int array in C++

Answer 1

#include <iostream>
#include <iomanip>

using namespace std;

#define N 3

class calc
{
  public:
	void print(int arr2d[][N]);
};
void calc::print(int arr2d[][N])
{
	for (int i = 0; i < N; i++)
	{
		for (int j = 0; j < N; j++)
			cout << setw(4) << arr2d[i][j];
		cout << endl;
	}
}

int main()
{
	int arr2d[N][N] = { { 1, 8, 5 },{ 6, 9, 1 },{ 9, 7, 6 } };
	calc c;

	c.print(arr2d);

	return 0;
}


/*
run:

1   8   5
6   9   1
9   7   6

*/

 

70+ SQL courses for beginners and professionals

Answer 2

#include <iostream>
#include <iomanip>
#include <random>  

using namespace std;

#define N 3

class calc
{
  public:
	void print(int arr2d[][N]);
};
void calc::print(int arr2d[][N])
{
	for (int i = 0; i < N; i++)
	{
		for (int j = 0; j < N; j++)
			cout << setw(4) << arr2d[i][j];
		cout << endl;
	}
}

int main()
{
	int arr2d[N][N];
	calc c;

	random_device rd;
	mt19937 random_generator(rd());
	uniform_int_distribution<int> uni(1, 9);

	for (int i = 0; i < N; i++)
	{
		for (int j = 0; j < N; j++)
		{
			auto n = uni(random_generator); 
			arr2d[i][j] = n;
		}
	}

	c.print(arr2d);

	return 0;
}


/*
run:

2   2   3
2   7   5
6   9   7

*/

 

70+ SQL courses for beginners and professionals

Answer 3

#include <iostream>
#include <iomanip>

using namespace std;

#define N 3

class calc
{
  public:
	void print(int arr2d[][N]);
};
void calc::print(int arr2d[][N])
{
	for (int i = 0; i < N; i++)
	{
		for (int j = 0; j < N; j++)
			cout << setw(4) << arr2d[i][j];
		cout << endl;
	}
}

int main()
{
	int arr2d[N][N]{ {0} };
	calc c;

	c.print(arr2d);

	return 0;
}


/*
run:

0   0   0
0   0   0
0   0   0

*/

 

70+ SQL courses for beginners and professionals