Simple Brainfuck interpreter written in C++

BrainfuckInterpreter.cpp

#include <iostream>
#include <stack>

int main()
{
	std::string program;

	unsigned char tape[30000] = {0};
	unsigned char* ptr = tape;

	std::stack<int> loopStack;

	std::cin>>program;

	for(unsigned int commandIndex = 0; commandIndex < program.size(); commandIndex++)
	{
		switch(program[commandIndex])
		{
			case '+':
				++*ptr;
				break;
			case '-':
				--*ptr;
				break;
			case '>':
				++ptr;
				break;
			case '<':
				--ptr;
				break;
			case '.':
				std::cout<<*ptr<<std::endl;
				break;
			case ',':
				std::cin>>ptr;
				break;
			case '[':
				loopStack.push(commandIndex);
				break;
			case ']':
				if(*ptr == 0)
					loopStack.pop();
				else
					commandIndex = loopStack.top();
		}
	}

	return 0;
}