pattern generation

parantheses.c

#include<stdio.h>

int n;
void print(char *pattern,int index,int open,int close);
int main()
{
	
	printf("enter the number of parantheses");
	scanf("%d",&n);
	
	static char pattern[100] ;
	print(pattern,0,0,0);
	return 0;
	
}

void print(char *pattern,int index,int open,int close)
{
	if(close==n)
	{
		pattern[2*n]='\0';
		printf("%s\n",pattern);
		return;
	}
	if(open>close)
	{
		pattern[index] = '}';
		print(pattern,index+1,open,close+1);
	}
	if(open<n)
	{
		pattern[index]='{';
		print(pattern,index+1,open+1,close);
	}
}