\(\begin{array}{ccccccccc}&&&&*&&&&\\&&&I&*&I&&&\\&&*&*&*&*&*&&\\&I&*&*&*&*&*&I&\\*&*&*&*&*&*&*&*&*\end{array}\) 

We want to write a program that displays Christmas trees with candles of different heights.

• All the candles are at the edge of the tree.
• The top of the tree does not have a candle.
• Lines without candles alternate with lines with candles

#include<stdio.h>
#include<conio.h>

void main()
{
	int N, i, j;
	do{
		printf("Enter N: ");
		scanf("%d",&N);
	}while(N<=0);

	for (i = 0; i < N; i++) 
	{
		// printing the spaces
		for (j = 0; j < N-i-1; j++) 
			printf(" ");

		// printing candle or a star
		if (i%2)
			printf("I");
		else
			printf("*");
	
		for (j = 0; j < 2*i-1; j++) 
			printf("*");

		if (i%2) 
			printf("I");
		else
			if (i>0) 
				printf("*");

		printf("\n");
	}

	getch();
}