rhombus with numbers

ce08.1.stairofnumbers.cpp

// 1.stairofnumbers.cpp
// juanfc 2025-10-15
//

#include <iostream>
using namespace std;

int main()
{
    int n = 4;

    // each growing line
    for (int width = 1; width <= n; ++width) {
        // first spaces
        for (int i = 0; i < n-width; ++i) {
            cout << ' ';
        }
        // then ascending numbers
        for (int i = 1; i <= width; ++i) {
            cout << i;
        }
        // then descending numbers
        for (int i = width-1; i > 0; --i) {
            cout << i;
        }
        // ending the line!
        cout << endl;
    }

    // now the shrinking lines
    for (int width = n-1; width > 0; --width) {
        // first spaces
        for (int i = 0; i < n-width; ++i) {
            cout << ' ';
        }
        // then ascending numbers
        for (int i = 1; i <= width; ++i) {
            cout << i;
        }
        // then descending numbers
        for (int i = width-1; i > 0; --i) {
            cout << i;
        }
        // ending the line!
        cout << endl;
    }

    return 0;
}
/* prints:
   1
  121
 12321
1234321
 12321
  121
   1
*/