Bt reer program language

From: http://coolshell.cn/articles/1142.html

There will never be a lack of alternative things in the world of human nature, and the world of computer. In terms of programming language, friends who have read this site "6 abnormal C language Hello World Program" must be familiar with Bt and alternative programs, but they are all pediatrics, the true Bt and alternative are completed at the language level. Let's take a look at the alternative language brainfuck. If you see the name of this language, please do not think it is a funny language. This is a "serious thing". Please read this article with "the most devout attitude.

BF language Introduction

BrainfuckIs a minimal computer language, which was created by urban Müller in 1993. This language is sometimes calledBrainf ** KOrBrainf ***Or even referred toBF. This language is a language designed according to the idea of "Turing complete (complete Turing Machine)". Its main design idea is to implement a "simple" language with the smallest concept, the brainf ** K language has only eight symbols, and all operations are completed by the combination of these eight symbols.

BF is based on a simple machine model. Besides eight commands, this machine also includes: an array in bytes, initialized to zero, a pointer to the array (the first byte pointing to the array at the beginning), and two byte streams used for input and output.

The following is a description of these eight commands, each of which is identified by one character:

 

Character	Description
>	Pointer plus one
<	Pointer minus one
+	The value of the byte pointed to by the pointer plus one
-	The value of the byte pointed to by the pointer minus one.
.	The unit content pointed to by the output pointer (ASCII code)
,	Input content to the Unit pointed to by the pointer (ASCII code)
[	If the unit value pointed to by the pointer is zero, jump backward to the corresponding]Command
]	If the unit value pointed to by the pointer is not zero, jump forward to the corresponding[Command

(According to the simple statement that saves more time,]It can also be said that "Jump backward to the corresponding[Status ". These two interpretations are the same .)

(Third, the same price statement,[It means "jump forward to the corresponding]",]It means "Jump backward to the corresponding[Command, if the pointer points to a non-zero byte. ")

The brainfuck program can be translated into C language using the following replacement method (assumingptrYeschar*Type ):

Brainfuck	C
>	++ptr;
<	--ptr;
+	++*ptr;
-	--*ptr;
.	putchar(*ptr);
,	*ptr =getchar();
[	while (*ptr) {
]	}

BF Interpreter

Because brainfuck has only eight commands, and does not have keywords or custom identifiers, it is very simple to implement the compiler. Anyone who is new to C can compile it by themselves, although everyone here can compile one by themselves, I will give you an official version to attract your interest. This program has only 50 lines and is fully written by ansi c. Therefore, you can find a C-language compiler and compile it.

12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758

#include <stdio.h>; intp, r, q;char a[5000], f[5000], b, o, *s=f; void interpret(char *c){    char *d;     r++;    while( *c ) {        //if(strchr("<>;+-,.[]/n",*c))printf("%c",*c);        switch(o=1,*c++) {            case '<': p--;        break;            case '>;': p++;       break;            case '+': a[p]++;     break;            case '-': a[p]--;     break;            case '.': putchar(a[p]); fflush(stdout); break;            case ',': a[p]=getchar();fflush(stdout); break;            case '[':                for( b=1,d=c; b && *c; c++ )                b+=*c=='[', b-=*c==']';                if(!b) {                    c[-1]=0;                    while( a[p] )                    interpret(d);                    c[-1]=']';                    break;                }            case ']':                puts("UNBALANCED BRACKETS"), exit(0);            case '#':                if(q>;2)                printf("%2d %2d %2d %2d %2d %2d %2d %2d %2d %2d/n%*s/n",                *a,a[1],a[2],a[3],a[4],a[5],a[6],a[7],a[8],a[9],3*p+2,"^");                break;            default: o=0;        }        if( p<0 || p>;100)            puts("RANGE ERROR"), exit(0);    }    r--;    //        chkabort();} main(int argc,char *argv[]){    FILE *z;     q=argc;     if(z=fopen(argv[1],"r")) {        while( (b=getc(z))>;0 )            *s++=b;        *s=0;        interpret(f);    }}

Of course, if you think that using the C language to implement the brainfuck language interpreter is an insult to the brainfuck language, our brainfuck community will never tolerate this idea. Because we have a compiler written in 100% pure brainfuck.Awib: Http://code.google.com/p/awib/

Hello World

++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.

Why? Can't you understand it? The following is an explanation:

+++ +++ +++ +           initialize counter (cell #0) to 10[                       use loop to set the next four cells to 70/100/30/10    > +++ +++ +             add  7 to cell #1    > +++ +++ +++ +         add 10 to cell #2    > +++                   add  3 to cell #3    > +                     add  1 to cell #4    <<< < -                 decrement counter (cell #0)]>++ .                   print 'H'>+.                     print 'e'+++ +++ +.              print 'l'.                       print 'l'+++ .                   print 'o'>++ .                   print ' '<<+ +++ +++ +++ +++ ++. print 'W'>.                      print 'o'+++ .                   print 'r'--- --- .               print 'l'--- --- --.             print 'd'>+.                     print '!'>.                      print '/n'

Related Links:

• BF Official Website: http://www.muppetlabs.com /~ Breadbox/BF /.
• BF Wikipedia: http://en.wikipedia.org/wiki/brainfuck.

Other alternative languages

If you want to think that BF is already very BT, you will be wrong. The following programming languages are more BT.

Whitespace Language

This is a programming language that uses only blank characters (spaces, tabs, and carriage returns), while all other visible characters are annotated. The following is an example:

 

What? You didn't see anything. That's right, because it is unique in the language. Visit the following link to view the Hello, world example. Remember to press Ctrl + A to view the program.

Official Website: http://compsoc.dur.ac.uk/whitespace/index.php.

Lolcode Language

Lolcode is a programming language built on a highly abbreviated network English language. Generally, if a person can understand this network English, he can understand the lolcode program source code without training. The following is the Hello, world routine:

HAICAN HAS STDIO?VISIBLE "HAI WORLD!"KTHXBYE

Official Website: http://lolcode.com/

Chinese Programming Language

Do not think that only foreigners are so Bt. China also has its own BT programming language.

Chinese basic

Chinese commands		Applesoft Basic
10 bu = 0		10 y = 0
20 water, fire		20 input E, F
30 from day = water to fire		30 For A = e to F
40 bu = Bu + logarithm (day)		40 y = Y + Log ()
50 next day		50 next
60 Bu		60 print y

Official website can not access, can only look at Wikipedia: http://en.wikipedia.org/wiki/Chinese_BASIC

Chinese Python language)

Is the following program cool?

#! /Usr/local/bin/cpython answer = read ('Do you think Chinese programming languages are valuable? (Yes/No) ') if the answer = 'you': Write' OK, let's work together! 'Otherwise, the answer =' 00': write' well, Chinese is not as a programming language value. 'otherwise: write' please think carefully before replying .'

Official Website: http://www.chinesepython.org/

It's almost the end. I 'd like to explain again that this is a very serious article.