Diagonal

#include <iostream>
#include <cctype>

#define EXAMPLE

using namespace std;

enum State { START, WORD, SPACE };

string acronym(string text);

int main()
{
    const int MAX = 20;
    #ifdef EXAMPLE
    int matrix[MAX][MAX] = {{1, 2, 3, 4},
                            {5, 6 ,7 ,8},
                            {9,10,11,12},
                            {13,14,15,16}};
    int n = 4;
    #else
    int matrix[MAX][MAX];
    int n;
    do
    {
        cout << "Enter n: ";
        cin >> n;
    }
    while (n < 1 || n > MAX);

    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < n; j++)
        {
            cin >> matrix[i][j];
        }
    }
    #endif

    for (int i = 0; i < n; i++)
    {
        for (int row = i, col = 0; row >= 0 ; row--, col++)
        {
            cout << matrix[row][col] << " ";
        }
        cout << endl;
    }

    for (int i = 1; i < n ; i++)
    {
        for (int col = i, row = n - 1; col < n; row--, col++)
        {
            cout << matrix[row][col] << " ";
        }
        cout << endl;
    }

    return 0;
}

string acronym(string text)
{
    State st = START;
    string acr = "";
    if (isalpha(text[0]))
    {
        st = WORD;
        acr += toupper(text[0]);
    }
    else
    {
        st = SPACE;
    }
    for (int i = 1; i <= text.length(); i++)
    {
        if (st == SPACE)
        {
            if (isalpha(text[i]))
            {
                st = WORD;
                acr += toupper(text[i]);
            }
        }
        else if (st == WORD)
        {
            if (!isalpha(text[i]))
            {
                st = SPACE;
            }
        }
    }
    return acr;
}