升级版三角形

#include <iostream>
using namespace std;

int main() {
	char c;
	cin >> c;
	if (c >='A' && c <= 'Z') {
		for (int i = 1; i <= c - 'A' + 1; i++) {
			for (int j = 1; j <= c - 'A' + 1 - i; j++) {
				cout << " " ;
			}
			for (int j = 1; j <= i; j++) {
				cout << (char)('A' + j - 1);
			}
			for (int j = i - 1; j >= 1; j--) {
				cout << (char)('A' + j - 1);
			}
			cout << endl; 
		}
	}
	else {
		for (int i = 1; i <= c - '1' + 1; i++) {
			for (int j = 1; j <= c - '1' + 1 - i; j++) {
				cout << " " ;
			}
			for (int j = 1; j <= i; j++) {
				cout << (char)('1' + j - 1);
			}
			for (int j = i - 1; j >= 1; j--) {
				cout << (char)('1' + j - 1);
			}
			cout << endl;
		}
	}
	return 0;
}