#include <iostream>

using std::cout;
using std::cerr;
using std::cin;
using std::endl;

typedef char (*p2D) [4];
typedef char (*p3D) [3][3];

void Out2D (p2D theArray, unsigned size)
{
    for (unsigned i = 0; i < size; ++i)
    {
        for (unsigned j = 0; j < 4; ++j) 
            cout << theArray [i][j];
        cout << '\n';
    }
    cout << '\n';
}

void Out3D (p3D theArray, unsigned size)
{
    for (unsigned i = 0; i < size; ++i)
    {
        for (unsigned j = 0; j < 3; ++j)
        {
            for (unsigned k = 0; k < 3; ++k) cout << theArray [i][j][k];
            cout << '\n';
        }
        cout << '\n';
    }
    cout << endl;
}


int main (int argc, char* argv [])
{
    char baseArray [] = "abcdefghijklmnopqrstuvwxyz12";

    cout << "1D array:\n";
    for (unsigned i = 0; i < 28; ++i) cout << baseArray [i];
    cout << "\n\n";

    cout << "2D array:\n";
    Out2D ((p2D) baseArray, 7);
    cout << "3D array:\n";
    Out3D ((p3D) baseArray, 3);
    cout << endl;

    return 0;
}

#include <stdio.h>

int main()
{
	FILE *input_file;
	FILE *output_file;
	char input[21];
	char output[21];
	char matrix[4][5];
	int x, y, i;
	printf("Opening file...\n");
	input_file = fopen("input_file.txt", "r");
	if (input_file == NULL) {
		printf("Could not open %s\n", "input_file.txt");
		return 1;
	}
	else {
		fgets(input, 21, input_file);
		fclose(input_file);
	}
	for (i=0;i<21;i++)
	{
		printf("%c", input[i]);
	}
	printf("\n");
	printf("Encrypting...\n");
	for(y=0; y<=4; y++)
	{
		for(x=0; x<=4; x++)
		{
			matrix[x][y] = input[(y+4*x)];
		}
	}
	i = 0;
	for (y=0;y<=4;y++)
	{
		for (x=0;x<=4;x++)
		{
			output[i] = matrix[x][y];
			i = (i+1);
		}
	}
	for (i=0;i<21;i++)
	{
		printf("%c", output[i]);
	}
	printf("\n");
	return 0;
}

	for(y=0; y<=4; y++)
	{
		for(x=0; x<=4; x++)
		{
			matrix[x][y] = input[(y+4*x)];
		}
	}