#include <iostream>
#include <iomanip>
using namespace std;
 
void printPyramid(int final);
 
int main() {
	int final;
 
	cout << "Please enter an integer from 1 to 15: ";
	cin >> final;
 
	if (cin.fail()) { // ALWAYS check for errors
		cerr << "Invalid input" << endl;
		return -1;
	}
	if (final < 1 || final > 15) {
		cerr << "Number must be between 1 and 15" << endl;
		return -1;
	}
	cout << endl; // (not really needed)
 
	printPyramid(final);
}
 
void printPyramid(int final) {
	int width = (final < 10) ? 2 : 3; // num over 10 need column size of 3
 
	for (int row = 1; row <= final; row++) {
		// Print spaces.
		// There are final - row columns before the first number
		for (int col = 1; col <= final - row; col++) {
			cout << setw(width) << " ";
		}
 
		// Prints numbers decending from row to 1
		for (int num = row; num > 0; num--) {
			cout << setw(width) << num;
		}
 
		// Prints numbers ascending from 2 to row
		for (int num = 2; num <= row; num++) {
			cout << setw(width) << num;
		}
		cout << endl;
	}
}
 

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15