triangle.c

/*
 * Author: Jeremy Yen Date: 2013.10.11
 * http://oj.sslab.cs.nthu.edu.tw/problems/11
 *
 */

#include <stdio.h>
#include <stdlib.h>

int main()
{
	int n, i, j, k;
	scanf("%d", &n);

	for( i = 3; i <= (n+2); i++ )
	{
		for( j = 1; j <= i; j++ )
		{
			int star_count = 2 * j - 1;
			int space_count = ((2 * (n + 2) - 1) / 2);
			space_count -= (int)(star_count / 2 );

			for( k = 0; k < space_count; k++ )
				printf(" ");
			for( k = 0; k < star_count; k++ )
				printf("*");
			for( k = 0; k < space_count; k++ )
				printf(" ");

			printf("\n");
		}
	}

	return 0;
}