Brainfuck.cpp

#include<iostream>
#include<vector>
#include<string>

int main(){
	std::vector<char> memory(10000, 0);
	int pointer = 0;
	int loop = 0;

	while(true){
		int o_pointer = 0;
		std::string brain_code;
		std::cout << ">>";
		std::cin >> brain_code;

		while(o_pointer < brain_code.length()){			
			switch(brain_code[o_pointer]){
				case '>':
					pointer++;
					break;
				case '<':
					pointer--;
					break;
				case '+':
					memory[pointer]++;
					break;
				case '-':
					memory[pointer]--;
					break;
				case '.':
					std::cout << memory[pointer]; 
					break;
				case ',':
					memory[pointer] = std::cin.get();
					break;
				case '[':
					if(memory[pointer] == 0){
						o_pointer++;
						while(loop > 0 ||  brain_code[o_pointer] != ']'){
							if(brain_code[o_pointer] == '[') loop++;
							if(brain_code[o_pointer] == ']') loop--;
							o_pointer++;
						}
					}
					break;
				case ']':
					if(memory[pointer] != 0){
						o_pointer--;
						while(loop > 0 || brain_code[o_pointer] != '['){
							if(brain_code[o_pointer] == '[') loop--;
							if(brain_code[o_pointer] == ']') loop++;
							o_pointer--;
						}
						o_pointer--;
					}
					break;
			}
			o_pointer++;
		}
		std::cout << std::endl;
	}
}