C堆栈和堆损坏

#include<stdio.h> 
 int main(void) 
 { 
     int b = 10; 
     int a[3]; 
     a[0] = 1; 
     a[1] = 2; 
     a[2] = 3; 

     printf(" b = %d n",b); 
     a[3] = 12; // oops it is invalid,behaviour is undefined
     printf(" b = %d n",b); 
     printf("address of b= %xn",&b);
     printf("address of a[3]= %xn",&a[3]);
     return 0; 
 }

我在visual studio 2010编译器(VC)上测试了以上程序&它给了我运行时错误,说：

stack around variable a gets corrupted

现在我的问题是：堆栈是否已终生损坏,或者仅在上述错误程序执行期间？

同样,我知道两次删除相同的指针可能会造成堆损坏等非常糟糕的事情.
以下代码：

int* p=new int();
delete p;
delete p;  // oops disaster here,undefined behaviour

当上面的代码片段执行时,VC在运行时显示堆损坏错误.