/*square.c				*/
/*display a hollow square on the screen	*/
/*author: Weiwei Chen			*/
/*date: Nov.27.2010			*/

#include <stdio.h>

#define SLEN 80
FILE *fout;

void square(int s)
{
	int r, i;
	for(r = 0; r < s; r ++ )
	{
		if(r == 0 || r == s - 1)
		{
			for(i = 0; i < s; i ++)
			{
				printf("*");
				fprintf(fout, "*");
			}
			printf("\n");
			fprintf(fout, "\n");
		}
		else
		{
			printf("*");
			fprintf(fout, "*");
			for(i = 0; i < s - 2; i ++)
			{
				printf(" ");
				fprintf(fout, " ");
			}
			printf("*\n");
			fprintf(fout, "*\n");
		}
	}
}


int main()
{
	char str[SLEN];
	printf("Please input the file name: ");
	scanf("%s", str);

	fout = fopen(str, "w");
	if(fout)
	{
		square(10);
	}
	else{
		printf("Failed to open file \"%s\"! \n", str);
	}
	fclose(fout);
	return 0;
}