brainfuck programming language

#include <stdio.h>

int main() {
    char array[30000] = {0};
    char *ptr = array;
    int loop = 0;
    char input;

    while ((input = getchar()) != EOF) {
        switch (input) {
            case '>':
                ++ptr;
                break;
            case '<':
                --ptr;
                break;
            case '+':
                ++*ptr;
                break;
            case '-':
                --*ptr;
                break;
            case '.':
                putchar(*ptr);
                break;
            case ',':
                *ptr = getchar();
                break;
            case '[':
                if (*ptr == 0) {
                    loop = 1;
                    while (loop > 0) {
                        input = getchar();
                        if (input == '[') {
                            loop++;
                        } else if (input == ']') {
                            loop--;
                        }
                    }
                }
                break;
            case ']':
                loop = 1;
                while (loop > 0) {
                    input = getchar();
                    if (input == '[') {
                        loop++;
                    } else if (input == ']') {
                        loop--;
                    }
                }
                fseek(stdin, -1, SEEK_CUR);
                break;
            default:
                break;
        }
    }

    return 0;
}

This C code is an interpreter for the Brainfuck programming language. It reads Brainfuck code from the standard input and executes it.

• The array represents the memory tape, initialized with 30,000 cells.
• ptr is a pointer that points to the current cell in the memory tape.
• It uses a switch-case structure to handle Brainfuck commands:
  • < and > move the pointer left and right.
  • + and - increment and decrement the value at the current cell.
  • . outputs the ASCII character of the current cell.
  • , takes a single character of input and stores its ASCII value in the current cell.
  • [ and ] are for loop structures. [ begins a loop, and ] ends a loop if the value at the current cell is zero.
• The code continues executing until it reaches the end of the input or encounters an EOF (End of File) signal.