How does the Brainfuck Hello World actually work?

Question

Someone sent this to me and claimed it is a hello world in Brainfuck (and I hope so...)

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


        

Answer 1

Brainfuck same as its name. It uses only 8 characters > [ . ] , - + which makes it the quickest programming language to learn but hardest to implement and understand. ….and makes you finally end up with f*cking your brain.

It stores values in array: [72 ][101 ][108 ][111 ]

let, initially pointer pointing to cell 1 of array:

1. > move pointer to right by 1

2. < move pointer to left by 1

3. + increment the value of cell by 1

4. - increment the value of element by 1

5. . print value of current cell.

6. , take input to current cell.

7. [ ] loop, +++[ -] counter of 3 counts bcz it have 3 ′+’ before it, and - decrements count variable by 1 value.

the values stored in cells are ascii values:

so referring to above array: [72 ][101 ][108 ][108][111 ] if you match the ascii values you’ll find that it is Hello writtern

Congrats! you have learned the syntax of BF

——-Something more ———

let us make our first program i.e Hello World, after which you’re able to write your name in this language.

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

breaking into pieces:

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

Makes an array of 4 cells(number of >) and sets a counter of 10 something like : —-psuedo code—-

array =[7,10,3,1]
i=10
while i>0:
 element +=element
 i-=1

because counter value is stored in cell 0 and > moves to cell 1 updates its value by+7 > moves to cell 2 increments 10 to its previous value and so on….

<<< return to cell 0 and decrements its value by 1

hence after loop completion we have array : [70,100,30,10]

>++. 

moves to 1st element and increment its value by 2(two ‘+’) and then prints(‘.’) character with that ascii value. i.e for example in python: chr(70+2) # prints 'H'

>+.

moves to 2nd cell increment 1 to its value 100+1 and prints(‘.’) its value i.e chr(101) chr(101) #prints ‘e’ now there is no > or < in next piece so it takes present value of latest element and increment to it only

+++++ ++..

latest element = 101 therefore, 101+7 and prints it twice(as there are two‘..’) chr(108) #prints l twice can be used as

for i in array:
    for j in range(i.count(‘.’)):
           print_value

———Where is it used?——-

It is just a joke language made to challenge programmers and is not used practically anywhere.