View Code of Problem 53

#include <stdio.h>
int main() {
	int n;
	int i, j, k;
	scanf("%d", &n);
	if (n <= 9 && n >= 0) 
	{
		for (i = 0; i < n; i++) 
		{
			for (j = 0; j < n - 1 - i; j++)
				printf(" ");
			for (k = 0; k < (2 * i) + 1; k++)
				printf("*");
			printf("\n");
		}
		for (i = 1; i < n; i++)
		{
			for (j = 0; j < i; j++)
				printf(" ");
			for (k = 0; k < 2 * (n - i) - 1; k++)
				printf("*");
			printf("\n");
		}
	}
}