// simplebf.c - a very simple bf interpreter
// takes a line of stdin as input

#include <stdio.h>
#include <string.h>

#define SIZE 30000

char t[SIZE], *p;

char *bf(char *s,int e) {
	char c;
	while (c=*s++) {
		if (e) c=='+'?(*p)++:c=='-'?(*p)--:c=='<'?p--:c=='>'?p++:c=='.'?putchar(*p):c==','?*p=getchar():0;
		if (c=='[') { while (*p) bf(s,1); s=bf(s,0); }
		if (c==']') break;

		if (p<t) p+=SIZE;
		if (t+SIZE<=p) p-=SIZE;
	}
	return s;
}

int main() { char s[10000]; gets(s); p=t; bf(s,1); }

~/languages/bf.html