an elegant solution to poj 1102

1102.c

#include <stdio.h>

static void hstretch(const char tbl[3], int n)
{
	putchar(tbl[0]);
	while (n--) putchar(tbl[1]);
	putchar(tbl[2]);
	putchar(' ');
}

static void shstretch(const char* str, const char* tbl, int n)
{

	while (*str) hstretch(&tbl[(*str++ - '0') * 3], n);
	putchar('\n');
}

static void svstretch(const char* str, const char* tbl, int n)
{
	for (int i=0; i<n; i++) shstretch(str, tbl, n);
}

static void sstretch(const char* str, const char* tbls[5], int n)
{
	shstretch(str, tbls[0], n);
	svstretch(str, tbls[1], n);
	shstretch(str, tbls[2], n);
	svstretch(str, tbls[3], n);
	shstretch(str, tbls[4], n);
	putchar('\n');
}

static void render_digits(const char* str, int n)
{
	static const char* tbls[] = {
		" -     -  -     -  -  -  -  - ",
		"| |  |  |  || ||  |    || || |",
		"       -  -  -  -  -     -  - ",
		"| |  ||    |  |  || |  || |  |",
		" -     -  -     -  -     -  - ",
	};
	sstretch(str, tbls, n);
}

int main()
{
	int n;
	char num[12];
	while (scanf("%d%s", &n, num) != EOF && n)
		render_digits(num, n);
	return 0;
}