Brainf**k in c++ https://ideone.com/GkS1L6

brainfxxk.cpp

#include <iostream>
#include <string>
#include <vector>
#include <stack>
#include <stdint.h>
using namespace std;

int main() {
	vector<uint8_t> mem(30000,0);
	stack<int> branchStack;
	string src;

	cin >> src;

	int ptr = 0;
	int pc = 0;
	for(pc = 0; pc < src.length() ; ++pc) {
		// cout << pc  << ":" << src[pc] << endl;
		switch(src[pc]) {
			case '+':
				mem[ptr]++;
				break;
			case '-':
				mem[ptr]--;
				break;
			case '>':
				ptr++;
				break;
			case '<':
				ptr--;
				break;
			case ',':
				cin >> mem[ptr];
				break;
			case '.':
				cout << (char)mem[ptr];
				break;
			case '[':
				if (mem[ptr]) {
					branchStack.push(pc - 1);
				} else {
					for(int nest = 1 ; nest > 0 && pc < src.length() - 1 ; ++pc) {
						switch(src[pc + 1]) {
							case '[':
								nest++;
								break;
							case ']':
								nest--;
								break;
						}
					}
				}
				break;
			case ']':
				pc = branchStack.top();
				branchStack.pop();
				break;
		}
	}
	return 0;
}