Visual C++ debug error

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VisualC++

I executed the following code :

class spchar
{

    char * st_string;
    long long int length;

public :


.
.
.
.
.

    ~spchar()
    {
        delete []st_string;
    }

I used this class in the main function in the following way :

spchar h = "Hello";

Upon running this code Visual C++ gives me the following error :

(The program returns the error when the h goes out of scope that is when delete operator is called in the destructor.)



Debug Error!

[Address of the application in disk]


HEAP CORRUPTION DETECTED : after Normal block(#137) at
0x00FA7FB8.
CRT detected that the application wrote to memory after end of heap buffer.


How to troubleshoot this issue ? Further do i need to explicitly delete this pointer by issuing this command delete []st_string , wont the destructor destroy it ?