C++返回局部变量的指针问题

#include <iostream>
int* zhizhen1()
{
	int* i = new int(1);
	return i;
}

int* zhizhen2()
{
	int* i;
	int c = 0;  //临时变量被释放了
	i = &c;
	return i;
}
int main(int argc, char **argv)
{
	int *o1 = zhizhen1();
	int *o2 = zhizhen2();
	std::cout<<*o1<<std::endl;  //正常显示
	std::cout<<*o2<<std::endl;  //出现错值
	system("pause");
	return 0;
}