brainfuck.c

//written entirely by boyned
//doesnt take any inputs bc im using coderpad

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

#define TAPE_LEN 256
#define ECHO_BEHAVIOR 0 //0 - ASCII (real bf), 1 - actual number

void brainfuck(const char* code){
  int tape[TAPE_LEN] = {0};
  int tapeIndex = 0;
  
  unsigned int i = 0;
  unsigned int loops[TAPE_LEN];
  unsigned int loopNumber = 0;
  
  while(i < strlen(code)){
    switch(code[i]){
      case '+':
        tape[tapeIndex]++;
        
        break;
      case '-':
        tape[tapeIndex]--;
        
        break;
      case '>':
        tapeIndex++;
        
        break;
      case '<':
        tapeIndex--;
        
        break;
      case '[':
        if(tape[tapeIndex] == 0){
          break;
        }
        
        loopNumber++;
        loops[loopNumber] = i;
        
        break;
      case ']':
        if(tape[tapeIndex] == 0){
          loopNumber--;
        }
        
        if(loopNumber > 0){
          i = loops[loopNumber];
        }
        
        break;
      case '.':
        printf(ECHO_BEHAVIOR ? "%d" : "%c", tape[tapeIndex]);
        
        break;
      case ',':
        tape[tapeIndex] = getchar();
        
        break;
    }
    
    i++;
  }
}

int main() {
  brainfuck("+[>,.-------------]<[<]>>[+++++++++++++.>]"); //ask for an input and then echo it when the user finishes
  
  return 0;
}