Tree shape | Pascal triangle using asterisk | C++

main.cpp

#include <iostream>
using namespace std;
int main(){
	int n=4;
	cout << "enter n: " << endl;
	cin >> n;
	cout << "result: " << endl;
	int start=n-1; // this where * starts in every row.
	int t=0;
	for(int i=0;i<n;i++){
		// this loops creates spaces left side of the triangle
		for(int j=0;j<start;j++){
			cout << " ";
		}
		// depending upon row being odd or even, position of asterisk and space changes
		if(i%2==0){
			for(int j=start;j<=start+(2*i+1);j++){
				// even row-odd col contains * and even row-even col contains space
				if(j%2==0){
					cout << " ";
				}else{
					cout << "*";
				}
			}
		}else{
			// odd row-even col contains * and odd row-odd col contains space
			for(int j=start;j<=start+(2*i+1);j++){
				if(j%2==0){
					cout << "*";
				}else{
					cout << " ";
				}
			}
		}
		start--;
		cout << endl;
	}
	return(0);
}